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Model compare

Claude Opus 4.6 vs GPT-5.1

The readout for Claude Opus 4.6 and GPT-5.1, before the detailed comparison sheet.

Model A

Claude Opus 4.6

Anthropic

Leading
vs

Model B

GPT-5.1

OpenAI

Contender

Key Takeaways

Weighted outcome: Claude Opus 4.6. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.

Decision read

Claude Opus 4.6

Claude Opus 4.6 has the higher weighted result; Model A / B score 53.7 to 46.3.

Evidence depth

122 data points

Includes 29 benchmark rows, 0 audit samples, and 10 provider examples.

Selection signal

Start with Claude Opus 4.6

The charts below split 39 high-signal samples across speed, scores, and audit health.

Change comparison

Switch either side of this report to compare another model with the same LMSpeed data pipeline.

Select a different model to open a new comparison URL.

Comparison sheet

This report only uses LMSpeed data for Claude Opus 4.6 and GPT-5.1: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.

Model compare
Claude Opus 4.6
GPT-5.1
Overall leaderLeadingContender
Weighted overall score53.7 pts46.3 pts
Benchmark category leads4 categories3 categories
Operational advantagesFree providers, Provider coverageCheapest input price, Average speed, First-token latency
Context window1M tokens400K tokens
Max output128K tokens128K tokens
Modalities

Input

TextImageFile

Output

Text

Input

ImageTextFile

Output

Text
Features
Text inputImage inputFile inputText outputTool callingStructured outputsJSON modeReasoning
Text inputImage inputFile inputText outputTool callingStructured outputsJSON modeReasoning

The overall result weights benchmark capability categories at 80% and price, API speed/latency, and availability at 20%. Recent test volume does not affect the winner, and missing benchmark categories are excluded.

Model metadata

Model compare
Claude Opus 4.6
GPT-5.1
DeveloperAnthropicOpenAI
ReleasedFeb 2026Nov 2025
ParametersNo dataNo data
TokenizerClaudeGPT
Knowledge cutoffNo dataNo data
OpenRouter IDanthropic/claude-opus-4.6openai/gpt-5.1
ReferencesNo dataNo data

When to choose each model

This report only uses LMSpeed data for Claude Opus 4.6 and GPT-5.1: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.

Claude Opus 4.6

Claude Opus 4.6 is stronger in benchmark categories (Agents, Coding, Knowledge, Math) and operational dimensions (Free providers, Provider coverage).

GPT-5.1

GPT-5.1 is stronger in benchmark categories (Reasoning, Multimodal, Instruction following) and operational dimensions (Cheapest input price, Average speed, First-token latency).

Benchmark score comparison

Third-party benchmark profile synced into LMSpeed; only metrics available for both models are shown.

Category performance

Compare benchmark category scores on a 0-100 scale. Select a category to inspect the gap.

Model A coverage
8 / 8
Model B coverage
7 / 8
Shared
7 shared categories

Avg. score

Claude Opus 4.6

51.8

Avg. score

GPT-5.1

51.1

Agents

Claude Opus 4.6 leads by 7.0

Claude Opus 4.654.3
GPT-5.147.3

Coding

Claude Opus 4.6 leads by 7.0

Claude Opus 4.656.6
GPT-5.149.6

Reasoning

GPT-5.1 leads by 0.4

Claude Opus 4.653.4
GPT-5.153.8

Knowledge

Claude Opus 4.6 leads by 1.9

Claude Opus 4.653.3
GPT-5.151.4

Math

Claude Opus 4.6 leads by 2.3

Claude Opus 4.655.7
GPT-5.153.4

Multilingual

Claude Opus 4.6

Claude Opus 4.648.4
GPT-5.1-

Multimodal

GPT-5.1 leads by 1.0

Claude Opus 4.647.8
GPT-5.148.8

Instruction following

GPT-5.1 leads by 8.8

Claude Opus 4.644.8
GPT-5.153.6

Professional benchmark details

Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.

Aggregatereported

BenchLM overall score

SourceClaude Opus 4.6

Claude Opus 4.6

62.0

Rank #41/111 · confidence 4 · eval date 2026-02-01

+4.0

GPT-5.1

winner

66.0

Rank #32/111 · confidence 2 · eval date 2025-11-13

Pricingverified

Input price

SourceClaude Opus 4.6 (Non-reasoning, High Effort)

Claude Opus 4.6

$5.00/M

Rank #168/186 · confidence 4

+$3.75/M

GPT-5.1

winner

$1.25/M

Rank #123/186 · confidence 4

Pricingverified

Blended price

SourceClaude Opus 4.6 (Non-reasoning, High Effort)

Claude Opus 4.6

$10.00/M

Rank #169/186 · confidence 4

+$6.56/M

GPT-5.1

winner

$3.44/M

Rank #139/186 · confidence 4

Pricingverified

Output price

SourceClaude Opus 4.6 (Non-reasoning, High Effort)

Claude Opus 4.6

$25.00/M

Rank #169/186 · confidence 4

+$15.00/M

GPT-5.1

winner

$10.00/M

Rank #142/186 · confidence 4

Reasoningreported

BenchLM Reasoning score

SourceClaude Opus 4.6

Claude Opus 4.6

67.1

Rank #42/67 · confidence 4 · eval date 2026-02-01

+8.9

GPT-5.1

winner

76.0

Rank #17/67 · confidence 2 · eval date 2025-11-13

Reasoningreported

AA-LCR

SourceClaude Opus 4.6

Claude Opus 4.6

67.0

Rank #71/106 · confidence 4 · eval date 2026-02-01

+13.0

GPT-5.1

winner

80.0

Rank #24/106 · confidence 2 · eval date 2025-11-13

Reasoningreported

CritPt

SourceClaude Opus 4.6

Claude Opus 4.6

2.8

Rank #57/88 · confidence 4 · eval date 2026-02-01

+2.1

GPT-5.1

winner

4.9

Rank #48/88 · confidence 2 · eval date 2025-11-13

Reasoningreported

MMLU-Pro

SourceClaude Opus 4.6

Claude Opus 4.6

winner

82.0%

Rank #50/129 · confidence 4 · eval date 2026-02-01

+1.9%

GPT-5.1

80.1%

Rank #62/129 · confidence 4

Reasoningverified

GPQA

SourceClaude Opus 4.6 (Non-reasoning, High Effort)

Claude Opus 4.6

84.0%

Rank #75/218 · confidence 4

+3.3%

GPT-5.1

winner

87.3%

Rank #52/218 · confidence 4

Reasoningverified

HLE

SourceClaude Opus 4.6 (Non-reasoning, High Effort)

Claude Opus 4.6

19.1%

Rank #89/216 · confidence 4

+9.4%

GPT-5.1

winner

28.5%

Rank #61/216 · confidence 4

Codingreported

Vibe Code Bench

SourceClaude Opus 4.6

Claude Opus 4.6

winner

57.6

Rank #5/33 · confidence 4 · eval date 2026-02-01

+33.0

GPT-5.1

24.6

Rank #18/33 · confidence 2 · eval date 2025-11-13

Codingreported

AA-SciCode

SourceClaude Opus 4.6

Claude Opus 4.6

winner

45.7

Rank #54/113 · confidence 4 · eval date 2026-02-01

+2.4

GPT-5.1

43.3

Rank #60/113 · confidence 3 · eval date 2025-11-13

Mathreported

FrontierMath v2 (Tiers 1-3)

SourceClaude Opus 4.6

Claude Opus 4.6

winner

40.7

Rank #10/47 · confidence 4 · eval date 2026-02-01

+9.7

GPT-5.1

31.0

Rank #19/47 · confidence 2 · eval date 2025-11-13

Mathreported

FrontierMath v2 (Tier 4)

SourceClaude Opus 4.6

Claude Opus 4.6

winner

22.9

Rank #11/36 · confidence 4 · eval date 2026-02-01

+10.4

GPT-5.1

12.5

Rank #17/36 · confidence 2 · eval date 2025-11-13

Mathreported

BenchLM Math score

SourceClaude Opus 4.6

Claude Opus 4.6

winner

58.6

Rank #29/63 · confidence 4 · eval date 2026-02-01

+9.4

GPT-5.1

49.2

Rank #37/63 · confidence 2 · eval date 2025-11-13

Knowledgereported

BenchLM Knowledge score

SourceClaude Opus 4.6

Claude Opus 4.6

winner

79.8

Rank #15/83 · confidence 4 · eval date 2026-02-01

+16.2

GPT-5.1

63.6

Rank #55/83 · confidence 2 · eval date 2025-11-13

Knowledgereported

AA-Omniscience Accuracy

SourceClaude Opus 4.6

Claude Opus 4.6

winner

45.8

Rank #23/106 · confidence 4 · eval date 2026-02-01

+8.1

GPT-5.1

37.7

Rank #43/106 · confidence 2 · eval date 2025-11-13

Knowledgereported

AA-Omniscience Index

SourceClaude Opus 4.6

Claude Opus 4.6

2.4

Rank #36/45 · confidence 4 · eval date 2026-02-01

+3.0

GPT-5.1

winner

5.4

Rank #29/45 · confidence 2 · eval date 2025-11-13

Knowledgereported

AA-Omniscience Hallucination Rate

SourceClaude Opus 4.6

Claude Opus 4.6

winner

80.1

Rank #43/106 · confidence 4 · eval date 2026-02-01

+28.2

GPT-5.1

51.9

Rank #74/106 · confidence 2 · eval date 2025-11-13

Knowledgereported

AA-GPQA Diamond

SourceClaude Opus 4.6

Claude Opus 4.6

84.0

Rank #67/113 · confidence 4 · eval date 2026-02-01

+3.3

GPT-5.1

winner

87.3

Rank #48/113 · confidence 2 · eval date 2025-11-13

Knowledgereported

AA-HLE

SourceClaude Opus 4.6

Claude Opus 4.6

19.1

Rank #74/114 · confidence 4 · eval date 2026-02-01

+9.4

GPT-5.1

winner

28.5

Rank #52/114 · confidence 2 · eval date 2025-11-13

Knowledgereported

Artificial Analysis Intelligence Index

SourceClaude Opus 4.6

Claude Opus 4.6

winner

26.4

Rank #57/117 · confidence 4 · eval date 2026-02-01

+1.6

GPT-5.1

24.7

Rank #67/117 · confidence 2 · eval date 2025-11-13

Multimodalreported

Design Arena Website

SourceClaude Opus 4.6

Claude Opus 4.6

winner

1306.0

Rank #14/78 · confidence 4 · eval date 2026-02-01

+105.0

GPT-5.1

1201.0

Rank #50/78 · confidence 2 · eval date 2025-11-13

Multimodalreported

BenchLM Multimodal Grounded score

SourceClaude Opus 4.6

Claude Opus 4.6

59.5

Rank #40/56 · confidence 4 · eval date 2026-02-01

+11.7

GPT-5.1

winner

71.2

Rank #25/56 · confidence 2 · eval date 2025-11-13

Multimodalreported

AA-MMMU-Pro

SourceClaude Opus 4.6

Claude Opus 4.6

72.5

Rank #45/68 · confidence 4 · eval date 2026-02-01

+3.0

GPT-5.1

winner

75.5

Rank #30/68 · confidence 2 · eval date 2025-11-13

Instruction followingreported

BenchLM Instruction Following score

SourceClaude Opus 4.6

Claude Opus 4.6

52.6

Rank #49/52 · confidence 4 · eval date 2026-02-01

+36.7

GPT-5.1

winner

89.3

Rank #20/52 · confidence 2 · eval date 2025-11-13

Instruction followingreported

AA-IFBench

SourceClaude Opus 4.6

Claude Opus 4.6

44.6

Rank #59/84 · confidence 4 · eval date 2026-02-01

+28.3

GPT-5.1

winner

72.9

Rank #26/84 · confidence 2 · eval date 2025-11-13

Agentsreported

Gert Labs

SourceClaude Opus 4.6

Claude Opus 4.6

winner

61.9

Rank #10/49 · confidence 4 · eval date 2026-02-01

+20.6

GPT-5.1

41.2

Rank #34/49 · confidence 2 · eval date 2025-11-13

Agentsreported

τ²-bench results

SourceClaude Opus 4.6

Claude Opus 4.6

winner

84.8

Rank #46/82 · confidence 4 · eval date 2026-02-01

+2.9

GPT-5.1

81.9

Rank #53/82 · confidence 2 · eval date 2025-11-13

API audit comparison

Latest completed audits from shared providers, with four safety and integrity score groups plus report links.

Provider
Claude Opus 4.6
GPT-5.1
No completed audits are available from shared providers yet.

Provider examples

Speed aggregates and input/output pricing share each provider row for real API selection and migration cost checks.

Provider
Claude Opus 4.6
GPT-5.1
钠 API20 tests

Claude Opus 4.6

speed / latency

42 tok/s / 2282ms

input / output

No data

GPT-5.1

speed / latency

N/A / N/A

input / output

No data

Rnglg2 API15 tests

Claude Opus 4.6

speed / latency

57 tok/s / 3926ms

input / output

No data

GPT-5.1

speed / latency

N/A / N/A

input / output

No data

巨量API12 tests

Claude Opus 4.6

speed / latency

24 tok/s / 7946ms

input / output

No data

GPT-5.1

speed / latency

139 tok/s / 1654ms

input / output

No data

BUZZ10 tests

Claude Opus 4.6

speed / latency

N/A / N/A

input / output

No data

GPT-5.1

speed / latency

137 tok/s / 3299ms

input / output

No data

ModelPool10 tests

Claude Opus 4.6

speed / latency

84 tok/s / 3916ms

input / output

No data

GPT-5.1

speed / latency

N/A / N/A

input / output

No data

兔子API

Claude Opus 4.6

claude-opus-4-6-high

speed / latency

No data

input / output

$0/request

GPT-5.1

gpt-5.1-all

speed / latency

No data

input / output

$0/request

Yun API

Claude Opus 4.6

claude-opus-4-6

speed / latency

No data

input / output

$0.342/M/$1.71/M

GPT-5.1

gpt-5.1

speed / latency

No data

input / output

$0.0014/request

KFCV50

Claude Opus 4.6

claude-opus-4-6

speed / latency

No data

input / output

$0.017/request

GPT-5.1

gpt-5.1

speed / latency

No data

input / output

$0.0068/request

Jeniya AI API

Claude Opus 4.6

claude-opus-4-6

speed / latency

No data

input / output

$0.131/M/$0.654/M

GPT-5.1

gpt-5.1

speed / latency

No data

input / output

$0.014/M/$0.109/M

N1N

Claude Opus 4.6

claude-opus-4-6

speed / latency

No data

input / output

$0.131/M/$0.654/M

GPT-5.1

gpt-5.1

speed / latency

No data

input / output

$0.014/M/$0.109/M

FAQ

Weighted outcome: Claude Opus 4.6. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.

Why is this comparison indexable?
It has 6 verifiable comparison points, and both models have pricing or benchmark data.
Are missing metrics invented?
No. Metrics without LMSpeed data are omitted from this report.

Rankings are based on community-submitted tests and periodic health probes. Advisory only, not official data.