Claude Opus 4.8 vs GPT-5.6 Sol

Updated September 24, 2026. Rank says GPT-5.6 Sol is ahead. Price, access, and your workload can each overturn that. Public scores include evidence status and uncertainty.

Decision reading

GPT-5.6 Sol has the higher public score, 78.49 versus 70.46, and the 90% score intervals do not overlap. 19 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 Opus 4.8

Anthropic

70.46/100

Supported · Public rank #14

90% interval 67.4–73.5

Model B

GPT-5.6 Sol

OpenAI

78.49/100

Supported · Public rank #7

90% interval 75.6–81.4

Shared results: 19
Claude Opus 4.8 only: 19
GPT-5.6 Sol only: 18
Like-for-like categories: 4 / 8

Supported: Claude Opus 4.8 and GPT-5.6 SolHow 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-5.6 Sol
GPT-5.6 Sol leads on the public coding lane, 71.6 to 63.3, with Supported evidence for both models, although the 90% intervals overlap.
Confidence: limited
Agentic work
Tool use, computer use, and multi-step task completion
GPT-5.6 Sol
GPT-5.6 Sol leads on the public agentic lane, 69.6 to 61.3, with Supported evidence for both models, although the 90% intervals overlap.
Confidence: limited
Long documents
Prompts that approach the documented context limit
GPT-5.6 Sol
GPT-5.6 Sol has the larger documented context window.
Confidence: documented

Show secondary and unsupported calls

Chat turn cost
1K fresh input + 500 output tokens
GPT-5.6 Sol
GPT-5.6 Sol 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
GPT-5.6 Sol
GPT-5.6 Sol has the lower estimated token cost for this stated workload. Claude Opus 4.8 has no published cached-input rate, so cached tokens use its listed input rate.
Confidence: rate-fallback
Repository review cost
50K fresh input + 3K output tokens
GPT-5.6 Sol
GPT-5.6 Sol 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.

63.3Claude Opus 4.871.6GPT-5.6 Sol

Like-for-like · BenchAlign v5.7

GPT-5.6 Sol leads the like-for-like coding row, although the 90% intervals overlap.

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 51.8
Claude Opus 4.8:31.250%
GPT-5.6 Sol:83.000%
Claude Opus 4.8 source GPT-5.6 Sol source
OSWorld 2.0Agentic
Normalized gap 42.0
Claude Opus 4.8:20.6%
GPT-5.6 Sol:62.6%
Claude Opus 4.8 source GPT-5.6 Sol source
FrontierMath v2 (Tiers 1-3)Math
Normalized gap 41.8
Claude Opus 4.8:47.241%
GPT-5.6 Sol:89.000%
Claude Opus 4.8 source GPT-5.6 Sol source
ARC-AGI-2Reasoning
Normalized gap 20.4
Claude Opus 4.8:72.1%
GPT-5.6 Sol:92.5%
Claude Opus 4.8 source GPT-5.6 Sol source
BrowseCompAgentic
Normalized gap 7.9
Claude Opus 4.8:84.3%
GPT-5.6 Sol:92.2%
Claude Opus 4.8 source GPT-5.6 Sol 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 v5.7 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 Opus 4.8: 61.3; Supported · #13/105
GPT-5.6 Sol: 69.6; Supported · #7/105
Basis: BenchAlign v5.7 lane · 12 vs 9 public rows
Reading: GPT-5.6 Sol leads · intervals overlap

Coding

Like-for-like

Claude Opus 4.8: 63.3; Supported · #12/135
GPT-5.6 Sol: 71.6; Supported · #6/135
Basis: BenchAlign v5.7 lane · 10 vs 12 public rows
Reading: GPT-5.6 Sol leads · intervals overlap

Reasoning

Like-for-like

Claude Opus 4.8: 59.0; #15/19
GPT-5.6 Sol: 72.1; #8/19
Basis: Provisional lane · 2 vs 2 weighted rows
Reading: GPT-5.6 Sol leads

Knowledge

Like-for-like

Claude Opus 4.8: 70.0; Supported · #11/158
GPT-5.6 Sol: 78.8; Supported · #7/158
Basis: BenchAlign v5.7 lane · 6 vs 8 public rows
Reading: GPT-5.6 Sol leads · intervals overlap

Multimodal

Directional only

Claude Opus 4.8: 87.7; #4/50
GPT-5.6 Sol: 87.6; #5/50
Basis: Provisional lane · 2 vs 1 weighted rows
Reading: Directional only

Instruction following

Directional only

Claude Opus 4.8: 74.0; #60/124
GPT-5.6 Sol: 87.7; #28/124
Basis: Provisional lane · 0 vs 0 weighted rows
Reading: Directional only

Multilingual

Not comparable

Claude Opus 4.8: Not ranked
GPT-5.6 Sol: Not ranked
Basis: Provisional lane · 0 vs 0 weighted rows
Reading: Not comparable

Math

Not comparable

Claude Opus 4.8: 65.2; #2/7
GPT-5.6 Sol: 96.8; Unranked · 3 rankable rows
Basis: Provisional lane · 3 vs 2 weighted rows
Reading: Not comparable

Category scores with the server-provided evidence basis for Claude Opus 4.8 and GPT-5.6 Sol
Category	Claude Opus 4.8	GPT-5.6 Sol	Basis	Reading
Agentic	61.3Supported · #13/105	69.6Supported · #7/105	Like-for-likeBenchAlign v5.7 lane · 12 vs 9 public rows	GPT-5.6 Sol leads · intervals overlap
Coding	63.3Supported · #12/135	71.6Supported · #6/135	Like-for-likeBenchAlign v5.7 lane · 10 vs 12 public rows	GPT-5.6 Sol leads · intervals overlap
Reasoning	59.0#15/19	72.1#8/19	Like-for-likeProvisional lane · 2 vs 2 weighted rows	GPT-5.6 Sol leads
Knowledge	70.0Supported · #11/158	78.8Supported · #7/158	Like-for-likeBenchAlign v5.7 lane · 6 vs 8 public rows	GPT-5.6 Sol leads · intervals overlap
Multimodal	87.7#4/50	87.6#5/50	Directional onlyProvisional lane · 2 vs 1 weighted rows	Directional only
Instruction following	74.0#60/124	87.7#28/124	Directional onlyProvisional lane · 0 vs 0 weighted rows	Directional only
Multilingual	Not ranked	Not ranked	Not comparableProvisional lane · 0 vs 0 weighted rows	Not comparable
Math	65.2#2/7	96.8Unranked · 3 rankable rows	Not comparableProvisional lane · 3 vs 2 weighted rows	Not comparable

Ranks count the models scored in each category’s lane, so the agentic, coding, and knowledge denominators (BenchAlign v5.7) 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 Opus 4.8: $0.0175; Fits in one request
GPT-5.6 Sol: $0.014; Fits in one request

GPT-5.6 Sol has the lower modeled cost

Costs use the listed standard API rates.

Repository review

50K fresh input + 3K output tokens

Claude Opus 4.8: $0.325; Fits in one request
GPT-5.6 Sol: $0.26; Fits in one request

GPT-5.6 Sol 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 Opus 4.8: $1.35; Fits in one request; Cached input priced at the published list-input rate
GPT-5.6 Sol: $0.36; Fits in one request

Claude Opus 4.8

Reasoning

GPT-5.6 Sol

Reasoning

Weight access

Claude Opus 4.8

Proprietary

GPT-5.6 Sol

Proprietary

License

Claude Opus 4.8

Proprietary

GPT-5.6 Sol

Proprietary

Release date

Claude Opus 4.8

2026-05-28

GPT-5.6 Sol

2026-07-09

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-5.6 Sol has the higher public score, 78.49 versus 70.46, and the 90% score intervals do not overlap.
Workload cost: Repository review: $0.325 vs $0.26. Cache-heavy agent loop: $1.35 vs $0.36.
Context tradeoff: GPT-5.6 Sol has the larger documented window (1.05M).

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

Questions

Which is better, Claude Opus 4.8 or GPT-5.6 Sol?

GPT-5.6 Sol has the higher public score, 78.49 versus 70.46, 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 Opus 4.8 or GPT-5.6 Sol?

GPT-5.6 Sol leads the public coding lane, 71.6 to 63.3, with Supported evidence for both models, although the 90% intervals overlap.

Which is better for agentic tasks, Claude Opus 4.8 or GPT-5.6 Sol?

GPT-5.6 Sol leads the public agentic tasks lane, 69.6 to 61.3, with Supported evidence for both models, although the 90% intervals overlap.

Which costs less, Claude Opus 4.8 or GPT-5.6 Sol?

For the stated presets, chat costs $0.0175 on Claude Opus 4.8 and $0.014 on GPT-5.6 Sol; repository review costs $0.325 and $0.26; the cache-heavy agent loop costs $1.35 and $0.36. Claude Opus 4.8 has no published cached-input rate, so cached tokens use its listed input rate.

Which has the larger context window, Claude Opus 4.8 or GPT-5.6 Sol?

GPT-5.6 Sol 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 evidence56 rows

Agentic

Terminal-Bench 3.0
Shared source
Claude Opus 4.821.1%
GPT-5.6 Sol34.6%
GPT-5.6 Sol leads this result
Terminal-Bench 2.1
Claude Opus 4.874.6%
Source
GPT-5.6 Sol91.9%
Source
GPT-5.6 Sol leads this result
BrowseComp
Claude Opus 4.884.3%
Source
GPT-5.6 Sol92.2%
Source
GPT-5.6 Sol leads this result
DeepSearchQA
Claude Opus 4.893.1%
Source
GPT-5.6 Sol—
Not directly comparable
OSWorld-Verified
Claude Opus 4.883.4%
Source
GPT-5.6 Sol—
Not directly comparable
Finance Agent v2
Claude Opus 4.853.9%
Source
GPT-5.6 Sol—
Not directly comparable
MCP Atlas
Claude Opus 4.882.2%
Source
GPT-5.6 Sol—
Not directly comparable
Toolathlon
Claude Opus 4.859.9%
Source
GPT-5.6 Sol58%
Source
Claude Opus 4.8 leads this result
Gert Labs
Claude Opus 4.872.97%
Source
GPT-5.6 Sol—
Not directly comparable
ResearchClawBench
Claude Opus 4.821.1%
Source
GPT-5.6 Sol—
Not directly comparable
OSWorld 2.0
Claude Opus 4.820.6%
Source
GPT-5.6 Sol62.6%
Source
GPT-5.6 Sol leads this result
Terminal-Bench 2.1 (Vals)
Claude Opus 4.871.9%
Source
GPT-5.6 Sol85.8%
Source
GPT-5.6 Sol leads this result
CyberGym
Claude Opus 4.8—
GPT-5.6 Sol84.5%
Source
Not directly comparable
ExploitGym
Claude Opus 4.8—
GPT-5.6 Sol33.7%
Source
Not directly comparable
ApprenticeBench
Claude Opus 4.8—
GPT-5.6 Sol26%
Source
Not directly comparable

Coding

SWE-bench Verified
Claude Opus 4.888.6%
Source
GPT-5.6 Sol—
Not directly comparable
SWE-bench Pro
Claude Opus 4.869.2%
Source
GPT-5.6 Sol64.6%
Source
Claude Opus 4.8 leads this result
SWE Multilingual
Claude Opus 4.884.4%
Source
GPT-5.6 Sol—
Not directly comparable
SWE Multimodal
Claude Opus 4.838.4%
Source
GPT-5.6 Sol—
Not directly comparable
Terminal-Bench 2.1
Claude Opus 4.874.6%
Source
GPT-5.6 Sol91.9%
Source
GPT-5.6 Sol leads this result
cursorBench31
Claude Opus 4.858.4%
Source
GPT-5.6 Sol—
Not directly comparable
cursorBench32
Shared source
Claude Opus 4.862.3%
GPT-5.6 Sol67.2%
GPT-5.6 Sol leads this result
FrontierCode 1.1 Main
Claude Opus 4.846.5%
Source
GPT-5.6 Sol—
Not directly comparable
LiveCodeBench (Vals)
Claude Opus 4.887.8%
Source
GPT-5.6 Sol82.6%
Source
Claude Opus 4.8 leads this result
SWE-bench (Vals)
Claude Opus 4.888.6%
Source
GPT-5.6 Sol96.2%
Source
GPT-5.6 Sol leads this result
Bug Hunt Bench
Claude Opus 4.8—
GPT-5.6 Sol42 fixes
Source
Not directly comparable
DeepSWE
Claude Opus 4.8—
GPT-5.6 Sol72.7%
Source
Not directly comparable
FrontierCode 1.1 Extended
Claude Opus 4.8—
GPT-5.6 Sol60.6%
Source
Not directly comparable
FrontierSWE v2
Claude Opus 4.8—
GPT-5.6 Sol32.2%
Source
Not directly comparable
VulcanBench v3
Claude Opus 4.8—
GPT-5.6 Sol87.0%
Source
Not directly comparable
VulcanBench CII v1
Claude Opus 4.8—
GPT-5.6 Sol86.5%
Source
Not directly comparable
cursorBench40
Claude Opus 4.8—
GPT-5.6 Sol41.7%
Source
Not directly comparable

Reasoning

ARC-AGI-2
Claude Opus 4.872.1%
Source
GPT-5.6 Sol92.5%
Source
GPT-5.6 Sol leads this result
ARC-AGI-3
Claude Opus 4.81.5%
Source
GPT-5.6 Sol7.8%
Source
GPT-5.6 Sol leads this result
GeneBench-Pro
Claude Opus 4.8—
GPT-5.6 Sol28.7%
Source
Not directly comparable

Multimodal

OfficeQA Pro
Claude Opus 4.866.2%
Source
GPT-5.6 Sol—
Not directly comparable
ScreenSpot Pro
Claude Opus 4.887.9%
Source
GPT-5.6 Sol—
Not directly comparable
CharXiv
Claude Opus 4.889.9%
Source
GPT-5.6 Sol—
Not directly comparable
CharXiv w/o tools
Claude Opus 4.880.5%
Source
GPT-5.6 Sol—
Not directly comparable
MMMU-Pro
Claude Opus 4.8—
GPT-5.6 Sol83%
Source
Not directly comparable
MMMU-Pro w/ Python
Claude Opus 4.8—
GPT-5.6 Sol84.6%
Source
Not directly comparable

Knowledge

GPQA
Claude Opus 4.893.6%
Source
GPT-5.6 Sol94.6%
Source
GPT-5.6 Sol leads this result
GPQA-D
Claude Opus 4.893.6%
Source
GPT-5.6 Sol94.6%
Source
GPT-5.6 Sol leads this result
HLE
Claude Opus 4.857.9%
Source
GPT-5.6 Sol—
Not directly comparable
HLE w/o tools
Claude Opus 4.849.8%
Source
GPT-5.6 Sol—
Not directly comparable
GPQA Diamond (Vals)
Claude Opus 4.892.4%
Source
GPT-5.6 Sol95.2%
Source
GPT-5.6 Sol leads this result
MMLU-Pro (Vals)
Claude Opus 4.889.6%
Source
GPT-5.6 Sol89.1%
Source
Claude Opus 4.8 leads this result
HLE-Verified
Claude Opus 4.8—
GPT-5.6 Sol54.5%
Source
Not directly comparable
LABBench2
Claude Opus 4.8—
GPT-5.6 Sol82.1%
Source
Not directly comparable
HealthBench Professional
Claude Opus 4.8—
GPT-5.6 Sol60.5%
Source
Not directly comparable
HealthBench Hard
Claude Opus 4.8—
GPT-5.6 Sol33.1%
Source
Not directly comparable

Multilingual

INCLUDE
Claude Opus 4.887.6%
Source
GPT-5.6 Sol—
Not directly comparable

Math

USAMO 2026
Claude Opus 4.896.7%
Source
GPT-5.6 Sol—
Not directly comparable
FrontierMath v2 (Tiers 1-3)
Claude Opus 4.847.241%
Source
GPT-5.6 Sol89.000%
Source
GPT-5.6 Sol leads this result
FrontierMath v2 (Tier 4)
Claude Opus 4.831.250%
Source
GPT-5.6 Sol83.000%
Source
GPT-5.6 Sol leads this result
FrontierMath (legacy)
Claude Opus 4.8—
GPT-5.6 Sol89%
Source
Not directly comparable

56 public results · 19 shared

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Last updated September 24, 2026

Claude Opus 4.8 vs GPT-5.6 Sol

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

Reasoning

Knowledge

Multimodal

Instruction following

Multilingual

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 Opus 4.8 or GPT-5.6 Sol?

Which is better for coding, Claude Opus 4.8 or GPT-5.6 Sol?

Which is better for agentic tasks, Claude Opus 4.8 or GPT-5.6 Sol?

Which costs less, Claude Opus 4.8 or GPT-5.6 Sol?

Which has the larger context window, Claude Opus 4.8 or GPT-5.6 Sol?

Benchmark evidence

Agentic

Coding

Reasoning

Multimodal

Knowledge

Multilingual

Math

Related comparisons

Watch Claude Opus 4.8 vs GPT-5.6 Sol