Claude Sonnet 5 vs GPT-6 Astra

Updated October 17, 2026. Rank says GPT-6 Astra is ahead. Price, access, and your workload can each overturn that. Public scores include evidence status and uncertainty.

Decision reading

GPT-6 Astra has the higher public score, 83.88 versus 64.84, and the 90% score intervals do not overlap. 8 results are shared. Category rows resting on Estimated evidence or different benchmark sets are marked directional and do not name a winner.

Model A

Claude Sonnet 5

Anthropic

64.84/100

Supported · Public rank #36

90% interval 59.9–69.8

Model B

GPT-6 Astra

OpenAI

83.88/100

Supported · Public rank #3

90% interval 79.4–88.3

Shared results: 8
Claude Sonnet 5 only: 21
GPT-6 Astra only: 32
Like-for-like categories: 3 / 8

Supported: Claude Sonnet 5 and GPT-6 AstraHow the comparison works

Which one for your work

Recommendations appear only when a shared evidence basis or an explicit operating constraint supports the call. Secondary and unsupported use cases stay disclosed below the initial list.

Coding work
Code generation, repair, and software-engineering tasks
GPT-6 Astra
GPT-6 Astra has the higher public coding point estimate, 75.5 to 57.5, with Supported evidence for both models. The conditional ranges do not establish rank confidence.
Confidence: limited
Agentic work
Tool use, computer use, and multi-step task completion
GPT-6 Astra
GPT-6 Astra has the higher public agentic point estimate, 74.8 to 66.3, with Supported evidence for both models. The conditional ranges do not establish rank confidence.
Confidence: limited
Long documents
Prompts that approach the documented context limit
GPT-6 Astra
GPT-6 Astra has the larger documented context window.
Confidence: documented

Show secondary and unsupported calls

Chat turn cost
1K fresh input + 500 output tokens
Claude Sonnet 5
Claude Sonnet 5 has the lower estimated token cost for this stated workload. Costs use the listed standard API rates.
Confidence: listed-rates
Cache-heavy agent loop cost
200K cached + 20K fresh input + 10K output tokens
Claude Sonnet 5
Claude Sonnet 5 has the lower estimated token cost for this stated workload. Costs use the listed standard API rates.
Confidence: listed-rates
Repository review cost
50K fresh input + 3K output tokens
Claude Sonnet 5
Claude Sonnet 5 has the lower estimated token cost for this stated workload. Costs use the listed standard API rates.
Confidence: listed-rates

Which one for a specific job

Choose a job from the LLM Selector's task catalog to see the category row it rests on, under the same basis rules as the table below. A directional row stays directional; choosing a job never creates a winner.

Pick the job you would use them for

The same task catalog as the LLM Selector. Each job names the evidence surface it rests on; nothing here adds a new score.

57.5Claude Sonnet 575.5GPT-6 Astra

Like-for-like · BenchAlign v5.8

GPT-6 Astra has the higher coding point estimate. Conditional score ranges do not establish rank confidence.

Coding scores combine specific tasks and setups. Match the editor, harness, and effort to your workflow.

Open the coding leaderboard Shortlist models for this job

Same basis rules as the category table below

Shape of the matched evidence

Only shared public evidence is shown. Sparse evidence stays a ruled list rather than being closed into a radar shape.

Too few matched category axes support a radar. The ruled list below shows only shared benchmark results; positions use each benchmark’s normalized display scale when available.

FrontierMath v2 (Tier 4)Math
Normalized gap 68.3
Claude Sonnet 5:29.268%
GPT-6 Astra:97.600%
Claude Sonnet 5 source GPT-6 Astra source
FrontierMath v2 (Tiers 1-3)Math
Normalized gap 28.1
Claude Sonnet 5:65.614%
GPT-6 Astra:93.684%
Shared source
BrowseCompAgentic
Normalized gap 6.8
Claude Sonnet 5:84.7%
GPT-6 Astra:91.5%
Claude Sonnet 5 source GPT-6 Astra source

Bars run 0–100 on each benchmark’s normalized display scale

Category results, on a stated basis

Each row shows the public-lane category score for both models: the BenchAlign v5.8 lane for agentic, coding, and knowledge, and the weighted public rows elsewhere, with the same rank each model page reports. A row is like-for-like only when both scores rest on Supported evidence or the same weighted set. Directional and not-comparable rows remain visible, but they never receive a winner.

Agentic

Like-for-like

Claude Sonnet 5: 66.3; Supported · #15/128
GPT-6 Astra: 74.8; Supported · #7/128
Basis: BenchAlign v5.8 lane · 8 vs 14 public rows
Reading: GPT-6 Astra leads · intervals overlap

Coding

Like-for-like

Claude Sonnet 5: 57.5; Supported · #25/150
GPT-6 Astra: 75.5; Supported · #4/150
Basis: BenchAlign v5.8 lane · 11 vs 6 public rows
Reading: GPT-6 Astra leads

Knowledge

Like-for-like

Claude Sonnet 5: 65.4; Supported · #34/184
GPT-6 Astra: 86.2; Supported · #3/184
Basis: BenchAlign v5.8 lane · 6 vs 7 public rows
Reading: GPT-6 Astra leads

Reasoning

Not comparable

Claude Sonnet 5: 82.2; Unranked · 2 rankable rows
GPT-6 Astra: 93.3; #1/28
Basis: Provisional lane · 0 vs 2 weighted rows
Reading: Not comparable

Multimodal

Not comparable

Claude Sonnet 5: 82.0; #15/54
GPT-6 Astra: 87.3; Unranked · 3 rankable rows
Basis: Provisional lane · 1 vs 0 weighted rows
Reading: Not comparable

Multilingual

Not comparable

Claude Sonnet 5: Not ranked
GPT-6 Astra: Not ranked
Basis: Provisional lane · 0 vs 0 weighted rows
Reading: Not comparable

Instruction following

Not comparable

Claude Sonnet 5: Not ranked
GPT-6 Astra: Not ranked
Basis: Provisional lane · 0 vs 0 weighted rows
Reading: Not comparable

Math

Not comparable

Claude Sonnet 5: 69.4; Unranked · 2 rankable rows
GPT-6 Astra: 97.3; Unranked · 2 rankable rows
Basis: Provisional lane · 2 vs 2 weighted rows
Reading: Not comparable

Category scores with the server-provided evidence basis for Claude Sonnet 5 and GPT-6 Astra
Category	Claude Sonnet 5	GPT-6 Astra	Basis	Reading
Agentic	66.3Supported · #15/128	74.8Supported · #7/128	Like-for-likeBenchAlign v5.8 lane · 8 vs 14 public rows	GPT-6 Astra leads · intervals overlap
Coding	57.5Supported · #25/150	75.5Supported · #4/150	Like-for-likeBenchAlign v5.8 lane · 11 vs 6 public rows	GPT-6 Astra leads
Knowledge	65.4Supported · #34/184	86.2Supported · #3/184	Like-for-likeBenchAlign v5.8 lane · 6 vs 7 public rows	GPT-6 Astra leads
Reasoning	82.2Unranked · 2 rankable rows	93.3#1/28	Not comparableProvisional lane · 0 vs 2 weighted rows	Not comparable
Multimodal	82.0#15/54	87.3Unranked · 3 rankable rows	Not comparableProvisional lane · 1 vs 0 weighted rows	Not comparable
Multilingual	Not ranked	Not ranked	Not comparableProvisional lane · 0 vs 0 weighted rows	Not comparable
Instruction following	Not ranked	Not ranked	Not comparableProvisional lane · 0 vs 0 weighted rows	Not comparable
Math	69.4Unranked · 2 rankable rows	97.3Unranked · 2 rankable rows	Not comparableProvisional lane · 2 vs 2 weighted rows	Not comparable

Ranks count the models scored in each category’s lane, so the agentic, coding, and knowledge denominators (BenchAlign v5.8) differ from the provisional-lane categories. Unranked scores sit on the provisional lane’s scale but never name a winner. Like-for-like rows within 0.5 points read as a practical tie.

Supported evidence per lane · bars run 0–100Methodology

What each workload costs

Three fixed token mixes turn per-token rates into comparable decisions. Each scenario states context fit and whether cached input had to fall back to the published list-input rate.

Chat turn

1K fresh input + 500 output tokens

Claude Sonnet 5: $0.007; Fits in one request
GPT-6 Astra: $0.035; Fits in one request

Claude Sonnet 5 has the lower modeled cost

Costs use the listed standard API rates.

Repository review

50K fresh input + 3K output tokens

Claude Sonnet 5: $0.13; Fits in one request
GPT-6 Astra: $0.65; Fits in one request

Claude Sonnet 5 has the lower modeled cost

Costs use the listed standard API rates.

Cache-heavy agent loop

200K cached + 20K fresh input + 10K output tokens

Claude Sonnet 5: $0.18; Fits in one request
GPT-6 Astra: $0.9; Fits in one request

Claude Sonnet 5 has the lower modeled cost

Costs use the listed standard API rates.

Cached input falls back to the list input rate only where a cached rate is unpublished

Specification differences

Sourced differences are shown directly. Missing facts stay explicit instead of being inferred from a model name or family.

SpecificationClaude Sonnet 5GPT-6 Astra

Context window

Maximum documented context; output-token limits may be lower.

Claude Sonnet 5

Anthropic model overview

GPT-6 Astra

1.05M

OpenAI GPT-6 Astra model documentation

API model ID

Claude Sonnet 5

claude-sonnet-5

Anthropic model overview

GPT-6 Astra

gpt-6-astra

OpenAI GPT-6 Astra model documentation

Cached-input rate

A missing cached-input rate falls back to the listed input rate only in the stated workload estimate.

Claude Sonnet 5

$0.2 per 1M cached input tokens

Claude API pricing

GPT-6 Astra

$1 per 1M cached input tokens

OpenAI GPT-6 Astra model documentation

Documented inputs

Claude Sonnet 5

text, image

Anthropic model overview

GPT-6 Astra

text, image

OpenAI GPT-6 Astra model documentation

Documented outputs

Claude Sonnet 5

text

Anthropic model overview

GPT-6 Astra

text

OpenAI GPT-6 Astra model documentation

Provider availability

Claude Sonnet 5

Generally Available · Claude API

Anthropic model overview

GPT-6 Astra

Limited Availability · OpenAI Responses API, OpenAI Chat Completions API, ChatGPT Plus, Pro, Business, and Enterprise, Microsoft Azure, AWS Bedrock

OpenAI GPT-6 Astra model documentation

Reasoning profile

Claude Sonnet 5

Reasoning

GPT-6 Astra

Reasoning

Weight access

Claude Sonnet 5

Proprietary

GPT-6 Astra

Proprietary

License

Claude Sonnet 5

Proprietary

GPT-6 Astra

Proprietary

Release date

Claude Sonnet 5

2026-06-30

GPT-6 Astra

2026-09-03

If you already use one of these models

Deployment change: The models list different providers, so authentication, endpoint behavior, limits, and feature support may change.
Quality signal: GPT-6 Astra has the higher public score, 83.88 versus 64.84, and the 90% score intervals do not overlap.
Workload cost: Repository review: $0.13 vs $0.65. Cache-heavy agent loop: $0.18 vs $0.9.
Context tradeoff: GPT-6 Astra has the larger documented window (1.05M).

Run the same representative tasks against both endpoints before changing production traffic.

Questions

Which is better, Claude Sonnet 5 or GPT-6 Astra?

GPT-6 Astra has the higher public score, 83.88 versus 64.84, and the 90% score intervals do not overlap. That is the clearest overall quality signal in the current public data.

Which is better for coding, Claude Sonnet 5 or GPT-6 Astra?

GPT-6 Astra has the higher public coding point estimate, 75.5 to 57.5, with Supported evidence for both models. The conditional ranges do not establish rank confidence.

Which is better for agentic tasks, Claude Sonnet 5 or GPT-6 Astra?

GPT-6 Astra has the higher public agentic tasks point estimate, 74.8 to 66.3, with Supported evidence for both models. The conditional ranges do not establish rank confidence.

Which costs less, Claude Sonnet 5 or GPT-6 Astra?

For the stated presets, chat costs $0.007 on Claude Sonnet 5 and $0.035 on GPT-6 Astra; repository review costs $0.13 and $0.65; the cache-heavy agent loop costs $0.18 and $0.9. Costs use the listed standard API rates.

Which has the larger context window, Claude Sonnet 5 or GPT-6 Astra?

GPT-6 Astra has the larger documented context window: 1.05M, compared with 1M.

Benchmark evidence

The full public result ledger is available for audit without forcing a wide desktop table onto a phone.

Browse raw public benchmark evidence61 rows

Agentic

Terminal-Bench 3.0
Claude Sonnet 514.6%
Source
GPT-6 Astra—
Not directly comparable
Terminal-Bench 2.1
Claude Sonnet 580.4%
Source
GPT-6 Astra—
Not directly comparable
BrowseComp
Claude Sonnet 584.7%
Source
GPT-6 Astra91.5%
Source
GPT-6 Astra leads this result
HLE w/ tools
Claude Sonnet 557.4%
Source
GPT-6 Astra57.2%
Source
Claude Sonnet 5 leads this result
OSWorld-Verified
Claude Sonnet 581.2%
Source
GPT-6 Astra—
Not directly comparable
Terminal-Bench 2.1 (Vals)
Claude Sonnet 574.5%
Source
GPT-6 Astra87.3%
Source
GPT-6 Astra leads this result
ApprenticeBench
Shared source
Claude Sonnet 516%
GPT-6 Astra68%
GPT-6 Astra leads this result
MazeBench
Claude Sonnet 50%
Source
GPT-6 Astra23%
Source
GPT-6 Astra leads this result
OSWorld 2.0
Claude Sonnet 5—
GPT-6 Astra72.6%
Source
Not directly comparable
Terminal-Bench 4.0
Claude Sonnet 5—
GPT-6 Astra57.90%
Source
Not directly comparable
Terminal-Bench-Science 0.1
Claude Sonnet 5—
GPT-6 Astra64.6%
Source
Not directly comparable
ExploitGym
Claude Sonnet 5—
GPT-6 Astra42.4%
Source
Not directly comparable
Agents' Last Exam
Claude Sonnet 5—
GPT-6 Astra59.3%
Source
Not directly comparable
AutomationBench
Claude Sonnet 5—
GPT-6 Astra41.4%
Source
Not directly comparable
CWE-bench v1
Claude Sonnet 5—
GPT-6 Astra68.0%
Source
Not directly comparable
Hermes Index
Claude Sonnet 5—
GPT-6 Astra56.3%
Source
Not directly comparable
Hermes Bench
Claude Sonnet 5—
GPT-6 Astra73.7%
Source
Not directly comparable

Coding

SWE-bench Verified
Claude Sonnet 585.2%
Source
GPT-6 Astra—
Not directly comparable
SWE-bench Pro
Claude Sonnet 563.2%
Source
GPT-6 Astra—
Not directly comparable
SWE Multilingual
Claude Sonnet 578.3%
Source
GPT-6 Astra—
Not directly comparable
SWE Multimodal
Claude Sonnet 528.1%
Source
GPT-6 Astra—
Not directly comparable
Terminal-Bench 2.1
Claude Sonnet 580.4%
Source
GPT-6 Astra—
Not directly comparable
FrontierCode 1.1 Main
Claude Sonnet 542.7%
Source
GPT-6 Astra53.3%
Source
GPT-6 Astra leads this result
CursorBench 3.2
Claude Sonnet 561.5%
Source
GPT-6 Astra—
Not directly comparable
VulcanBench CII v1
Claude Sonnet 589.2%
Source
GPT-6 Astra—
Not directly comparable
LiveCodeBench (Vals)
Claude Sonnet 582.4%
Source
GPT-6 Astra—
Not directly comparable
SWE-bench (Vals)
Claude Sonnet 579.6%
Source
GPT-6 Astra—
Not directly comparable
CursorBench 4.0
Claude Sonnet 534.1%
Source
GPT-6 Astra—
Not directly comparable
DeepSWE
Claude Sonnet 5—
GPT-6 Astra74.1%
Source
Not directly comparable
FrontierCode 1.1 Extended
Claude Sonnet 5—
GPT-6 Astra64.5%
Source
Not directly comparable
FrontierSWE v2
Claude Sonnet 5—
GPT-6 Astra65.5%
Source
Not directly comparable
PostTrainBench v1.1
Claude Sonnet 5—
GPT-6 Astra44.3%
Source
Not directly comparable
Bug Hunt Bench
Claude Sonnet 5—
GPT-6 Astra45.0 fixes
Source
Not directly comparable

Reasoning

STEMBench
Claude Sonnet 5—
GPT-6 Astra2.81
Source
Not directly comparable
ARC-AGI-1
Claude Sonnet 5—
GPT-6 Astra98.50%
Source
Not directly comparable
ARC-AGI-2
Claude Sonnet 5—
GPT-6 Astra95%
Source
Not directly comparable
ARC-AGI-3
Claude Sonnet 5—
GPT-6 Astra62.7%
Source
Not directly comparable
GeneBench-Pro
Claude Sonnet 5—
GPT-6 Astra37.8%
Source
Not directly comparable
MRCR v2 256K-512K
Claude Sonnet 5—
GPT-6 Astra100.0%
Source
Not directly comparable
MRCR v2 512K-1M
Claude Sonnet 5—
GPT-6 Astra96.3%
Source
Not directly comparable
GraphWalks BFS 256K–1M
Claude Sonnet 5—
GPT-6 Astra71.8%
Source
Not directly comparable

Multimodal

CharXiv
Claude Sonnet 588.3%
Source
GPT-6 Astra—
Not directly comparable
CharXiv w/o tools
Claude Sonnet 577%
Source
GPT-6 Astra—
Not directly comparable
ScreenSpot Pro
Claude Sonnet 5—
GPT-6 Astra92.7%
Source
Not directly comparable
BenchCAD Vision2Code (tools)
Claude Sonnet 5—
GPT-6 Astra0.959
Source
Not directly comparable

Knowledge

HLE
Claude Sonnet 557.4%
Source
GPT-6 Astra—
Not directly comparable
HLE w/o tools
Claude Sonnet 543.2%
Source
GPT-6 Astra—
Not directly comparable
HLE-Verified
Claude Sonnet 531.0%
Source
GPT-6 Astra—
Not directly comparable
LABBench2
Claude Sonnet 580.1%
Source
GPT-6 Astra—
Not directly comparable
GPQA Diamond (Vals)
Claude Sonnet 588.9%
Source
GPT-6 Astra—
Not directly comparable
MMLU-Pro (Vals)
Claude Sonnet 587.5%
Source
GPT-6 Astra—
Not directly comparable
GPQA
Claude Sonnet 5—
GPT-6 Astra96%
Source
Not directly comparable
GPQA-D
Claude Sonnet 5—
GPT-6 Astra96.0%
Source
Not directly comparable
HealthBench (raw)
Claude Sonnet 5—
GPT-6 Astra56.9%
Source
Not directly comparable
HealthBench (length-adjusted)
Claude Sonnet 5—
GPT-6 Astra58.3%
Source
Not directly comparable
HealthBench Professional
Claude Sonnet 5—
GPT-6 Astra64.7%
Source
Not directly comparable
HealthBench Professional (raw)
Claude Sonnet 5—
GPT-6 Astra68.2%
Source
Not directly comparable
HealthBench Hard
Claude Sonnet 5—
GPT-6 Astra36.6%
Source
Not directly comparable

Instruction following

Gray Swan IPI (15 attempts)
Claude Sonnet 5—
GPT-6 Astra8.5%
Source
Not directly comparable

Math

FrontierMath v2 (Tiers 1-3)
Shared source
Claude Sonnet 565.614%
GPT-6 Astra93.684%
GPT-6 Astra leads this result
FrontierMath v2 (Tier 4)
Claude Sonnet 529.268%
Source
GPT-6 Astra97.600%
Source
GPT-6 Astra leads this result

61 public results · 8 shared

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Last updated October 17, 2026

Claude Sonnet 5 vs GPT-6 Astra

Decision reading

Which one for your work

Coding work

Agentic work

Long documents

Chat turn cost

Cache-heavy agent loop cost

Repository review cost

Which one for a specific job

What is actually comparable

Shape of the matched evidence

Category results, on a stated basis

Agentic

Coding

Knowledge

Reasoning

Multimodal

Multilingual

Instruction following

Math

What each workload costs

Chat turn

Repository review

Cache-heavy agent loop

Specification differences

Context window

API model ID

Cached-input rate

Documented inputs

Documented outputs

Provider availability

Reasoning profile

Weight access

License

Release date

If you already use one of these models

Questions

Which is better, Claude Sonnet 5 or GPT-6 Astra?

Which is better for coding, Claude Sonnet 5 or GPT-6 Astra?

Which is better for agentic tasks, Claude Sonnet 5 or GPT-6 Astra?

Which costs less, Claude Sonnet 5 or GPT-6 Astra?

Which has the larger context window, Claude Sonnet 5 or GPT-6 Astra?

Benchmark evidence

Agentic

Coding

Reasoning

Multimodal

Knowledge

Instruction following

Math

Related comparisons

Watch Claude Sonnet 5 vs GPT-6 Astra