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Data

GLM-5.3-Flash vs GPT-6 Luna

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

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Decision reading

GPT-6 Luna has the higher public point estimate, 62.59 versus 58.02. Their conditional score ranges overlap. These ranges do not establish rank confidence. 9 results are shared. Category rows resting on Estimated evidence or different benchmark sets are marked directional and do not name a winner.

Model A
Z.AI logo

Z.AI

58.02/100

Estimated · Public rank #57

Conditional range 48.3–67.7

Model B
OpenAI logo

OpenAI

62.59/100

Supported · Public rank #43

90% interval 52.0–73.2

Shared results
9
GLM-5.3-Flash only
19
GPT-6 Luna only
14
Like-for-like categories
1 / 8
Estimated: GLM-5.3-Flash · Supported: GPT-6 Luna. Conditional ranges do not establish rank confidence.How 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 Luna

    GPT-6 Luna has the higher public coding point estimate, 51.8 to 47.4, 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 Luna

    GPT-6 Luna has the larger documented context window.

    Confidence: documented
Show secondary and unsupported calls
  • Agentic work

    Tool use, computer use, and multi-step task completion

    Not enough matched evidence

    GPT-6 Luna is scored on Estimated evidence for agentic, so the reading is directional rather than like-for-like.

    Confidence: limited
  • Chat turn cost

    1K fresh input + 500 output tokens

    Not enough matched evidence

    A complete comparable API-rate estimate is not available for both models.

    Confidence: listed-rates
  • Cache-heavy agent loop cost

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

    Not enough matched evidence

    A complete comparable API-rate estimate is not available for both models.

    Confidence: listed-rates
  • Repository review cost

    50K fresh input + 3K output tokens

    Not enough matched evidence

    A complete comparable API-rate estimate is not available for both models.

    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.

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

47.4GLM-5.3-Flash51.8GPT-6 Luna

Like-for-like · BenchAlign v5.8

GPT-6 Luna 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.

Same basis rules as the category table below

What is actually comparable

Shared results can support a head-to-head reading. Results present for only one model describe coverage, not superiority.

2 categories rest on Estimated evidence or different evidence sets. Those rows remain visible for coverage context but do not name a winner.

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 39.0
    GLM-5.3-Flash:17.073%
    GPT-6 Luna:56.098%
  • FrontierMath v2 (Tiers 1-3)Math

    Normalized gap 23.2
    GLM-5.3-Flash:55.789%
    GPT-6 Luna:78.947%
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.

Coding

Like-for-like
GLM-5.3-Flash
47.4
Supported · #54/157
GPT-6 Luna
51.8
Supported · #42/157
Basis
BenchAlign v5.8 lane · 8 vs 3 public rows
Reading
GPT-6 Luna leads · intervals overlap

Agentic

Directional only
GLM-5.3-Flash
57.7
Supported · #34/131
GPT-6 Luna
53.5
Estimated · #45/131
Basis
BenchAlign v5.8 lane · 9 vs 5 public rows
Reading
Directional only

Knowledge

Directional only
GLM-5.3-Flash
60.0
Estimated · #48/178
GPT-6 Luna
63.3
Supported · #40/178
Basis
BenchAlign v5.8 lane · 2 vs 5 public rows
Reading
Directional only

Reasoning

Not comparable
GLM-5.3-Flash
Not ranked
GPT-6 Luna
57.5
#22/25
Basis
Provisional lane · 0 vs 2 weighted rows
Reading
Not comparable

Multimodal

Not comparable
GLM-5.3-Flash
80.8
#19/59
GPT-6 Luna
81.9
Unranked · 1 rankable row
Basis
Provisional lane · 2 vs 0 weighted rows
Reading
Not comparable

Multilingual

Not comparable
GLM-5.3-Flash
Not ranked
GPT-6 Luna
Not ranked
Basis
Provisional lane · 0 vs 0 weighted rows
Reading
Not comparable

Instruction following

Not comparable
GLM-5.3-Flash
Not ranked
GPT-6 Luna
Not ranked
Basis
Provisional lane · 0 vs 0 weighted rows
Reading
Not comparable

Math

Not comparable
GLM-5.3-Flash
56.9
Unranked · 2 rankable rows
GPT-6 Luna
80.2
Unranked · 2 rankable rows
Basis
Provisional lane · 2 vs 2 weighted rows
Reading
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

GLM-5.3-Flash
Self-hosted; infrastructure cost varies
Fits in one request
GPT-6 Luna
$0.00035
Fits in one request

GLM-5.3-Flash has no comparable published API token rate.

Repository review

50K fresh input + 3K output tokens

GLM-5.3-Flash
Self-hosted; infrastructure cost varies
Fits in one request
GPT-6 Luna
$0.0065
Fits in one request

GLM-5.3-Flash has no comparable published API token rate.

Cache-heavy agent loop

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

GLM-5.3-Flash
Self-hosted; infrastructure cost varies
Fits in one request
Cached-input rate unavailable
GPT-6 Luna
$0.009
Fits in one request

GLM-5.3-Flash has no comparable published API token rate.

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.

Provider availability

GLM-5.3-Flash

Not sourced

GPT-6 Luna

Generally Available · OpenAI Responses API, OpenAI Chat Completions API, ChatGPT Work, Codex

OpenAI GPT-6 Sol and Luna launch

Reasoning profile

GLM-5.3-Flash

Reasoning

GPT-6 Luna

Reasoning

Weight access

GLM-5.3-Flash

Open Weight

GPT-6 Luna

Proprietary

License

GLM-5.3-Flash

Open Weight

GPT-6 Luna

Proprietary

Release date

GLM-5.3-Flash

2026-08-26

GPT-6 Luna

2026-09-22

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 Luna has the higher public point estimate, 62.59 versus 58.02. Their conditional score ranges overlap. These ranges do not establish rank confidence.
Workload cost
A complete comparable API-rate estimate is not available for both models.
Context tradeoff
GPT-6 Luna has the larger documented window (1.05M).
Run the same representative tasks against both endpoints before changing production traffic.

Questions

Which is better, GLM-5.3-Flash or GPT-6 Luna?

GPT-6 Luna has the higher public point estimate, 62.59 versus 58.02. Their conditional score ranges overlap. These ranges do not establish rank confidence. The page therefore keeps the decision tied to the specific documented workload.

Which is better for coding, GLM-5.3-Flash or GPT-6 Luna?

GPT-6 Luna has the higher public coding point estimate, 51.8 to 47.4, with Supported evidence for both models. The conditional ranges do not establish rank confidence.

Which is better for agentic tasks, GLM-5.3-Flash or GPT-6 Luna?

GLM-5.3-Flash scores higher for agentic tasks on the public lane, 57.7 to 53.5. GPT-6 Luna is scored on Estimated evidence for agentic tasks, so the reading is directional rather than like-for-like. BenchLM does not name a winner for agentic tasks from a directional reading; read the shared benchmark rows directly and test the models on the same task set.

Which costs less, GLM-5.3-Flash or GPT-6 Luna?

Both models do not have comparable published API token rates, so this page does not name a universal price winner.

Which has the larger context window, GLM-5.3-Flash or GPT-6 Luna?

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

Self-host vs API cost

Estimates at 50,000 req/day · 1000 tokens/req average.

GLM-5.3-Flash
API / mo$0
Self-host / mo$13,981
Break-even—
GPT-6 Luna
API / mo$450
Self-host / moNot listed
Break-even—
Proprietary model — self-hosting not applicable.
Model the full break-even

Benchmark evidence

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

Browse raw public benchmark evidence42 rows

Agentic

  • Terminal-Bench 2.1

    GLM-5.3-Flash84.3%
    Source
    GPT-6 Luna—

    Not directly comparable

  • Toolathlon-Verified

    GLM-5.3-Flash78.4%
    Source
    GPT-6 Luna—

    Not directly comparable

  • AutomationBench

    GLM-5.3-Flash48.8%
    Source
    GPT-6 Luna—

    Not directly comparable

  • Agents' Last Exam

    GLM-5.3-Flash26.3%
    Source
    GPT-6 Luna—

    Not directly comparable

  • HLE w/ tools

    GLM-5.3-Flash55.3%
    Source
    GPT-6 Luna—

    Not directly comparable

  • Terminal-Bench 2.1 (Vals)

    GLM-5.3-Flash62.9%
    Source
    GPT-6 Luna—

    Not directly comparable

  • Hermes Index

    Shared source
    GLM-5.3-Flash35.0%
    GPT-6 Luna33.9%

    GLM-5.3-Flash leads this result

  • Hermes Bench

    Shared source
    GLM-5.3-Flash68.9%
    GPT-6 Luna70.5%

    GPT-6 Luna leads this result

  • MazeBench

    GLM-5.3-Flash0%
    Source
    GPT-6 Luna0%
    Source

    Tie

  • ExploitGym

    GLM-5.3-Flash—
    GPT-6 Luna11.6%
    Source

    Not directly comparable

  • OSWorld 2.1 Offline

    GLM-5.3-Flash—
    GPT-6 Luna48.9%
    Source

    Not directly comparable

Coding

  • Terminal-Bench 2.1

    GLM-5.3-Flash84.3%
    Source
    GPT-6 Luna—

    Not directly comparable

  • DeepSWE

    GLM-5.3-Flash63.4%
    Source
    GPT-6 Luna66.6%
    Source

    GPT-6 Luna leads this result

  • NL2Repo

    GLM-5.3-Flash56.3%
    Source
    GPT-6 Luna—

    Not directly comparable

  • LiveCodeBench (Vals)

    GLM-5.3-Flash80.5%
    Source
    GPT-6 Luna—

    Not directly comparable

  • SWE-bench (Vals)

    GLM-5.3-Flash92.0%
    Source
    GPT-6 Luna—

    Not directly comparable

  • OpenHarmony Bench

    GLM-5.3-Flash57.3%
    Source
    GPT-6 Luna—

    Not directly comparable

  • FrontierSWE v2

    GLM-5.3-Flash18.1%
    Source
    GPT-6 Luna—

    Not directly comparable

  • Bug Hunt Bench

    Shared source
    GLM-5.3-Flash17.7 fixes
    GPT-6 Luna18.3 fixes

    GPT-6 Luna leads this result

  • FrontierCode 2.0

    GLM-5.3-Flash—
    GPT-6 Luna21.9%
    Source

    Not directly comparable

Reasoning

  • BioBasicsBench

    GLM-5.3-Flash—
    GPT-6 Luna37.6%
    Source

    Not directly comparable

  • ARC-AGI-1

    GLM-5.3-Flash—
    GPT-6 Luna86.67%
    Source

    Not directly comparable

  • ARC-AGI-2

    GLM-5.3-Flash—
    GPT-6 Luna59.3%
    Source

    Not directly comparable

  • ARC-AGI-3

    GLM-5.3-Flash—
    GPT-6 Luna0.1%
    Source

    Not directly comparable

  • ARC-AGI-3 Provider Adapter

    GLM-5.3-Flash—
    GPT-6 Luna0.59%
    Source

    Not directly comparable

Multimodal

  • ExtractBench (LlamaIndex)

    Shared source
    GLM-5.3-Flash80.75%
    GPT-6 Luna91.01%

    GPT-6 Luna leads this result

  • ParseBench

    Shared source
    GLM-5.3-Flash70.55%
    GPT-6 Luna64.13%

    GLM-5.3-Flash leads this result

  • OfficeQA Pro

    GLM-5.3-Flash62.4%
    Source
    GPT-6 Luna—

    Not directly comparable

  • CharXiv

    GLM-5.3-Flash89.4%
    Source
    GPT-6 Luna—

    Not directly comparable

  • Chartography (tools)

    GLM-5.3-Flash78.0%
    Source
    GPT-6 Luna—

    Not directly comparable

  • BabyVision

    GLM-5.3-Flash53.4%
    Source
    GPT-6 Luna—

    Not directly comparable

  • MMVU

    GLM-5.3-Flash80.5%
    Source
    GPT-6 Luna—

    Not directly comparable

  • ExtractBench Pro

    GLM-5.3-Flash—
    GPT-6 Luna0%
    Source

    Not directly comparable

Knowledge

  • GPQA Diamond (Vals)

    GLM-5.3-Flash86.4%
    Source
    GPT-6 Luna—

    Not directly comparable

  • MMLU-Pro (Vals)

    GLM-5.3-Flash86.1%
    Source
    GPT-6 Luna—

    Not directly comparable

  • HealthBench (raw)

    GLM-5.3-Flash—
    GPT-6 Luna50.0%
    Source

    Not directly comparable

  • HealthBench (length-adjusted)

    GLM-5.3-Flash—
    GPT-6 Luna54.5%
    Source

    Not directly comparable

  • HealthBench Professional

    GLM-5.3-Flash—
    GPT-6 Luna60.8%
    Source

    Not directly comparable

  • HealthBench Professional (raw)

    GLM-5.3-Flash—
    GPT-6 Luna61.2%
    Source

    Not directly comparable

  • HealthBench Hard

    GLM-5.3-Flash—
    GPT-6 Luna31.4%
    Source

    Not directly comparable

Math

  • FrontierMath v2 (Tiers 1-3)

    Shared source
    GLM-5.3-Flash55.789%
    GPT-6 Luna78.947%

    GPT-6 Luna leads this result

  • FrontierMath v2 (Tier 4)

    Shared source
    GLM-5.3-Flash17.073%
    GPT-6 Luna56.098%

    GPT-6 Luna leads this result

42 public results · 9 shared

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Last updated November 6, 2026