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Model compare

Claude Sonnet 4.6 vs GPT-5.1

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

Model A

Claude Sonnet 4.6

Anthropic

Leading
vs

Model B

GPT-5.1

OpenAI

Contender

Key Takeaways

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

Decision read

Claude Sonnet 4.6

Claude Sonnet 4.6 has the higher weighted result; Model A / B score 52 to 48.

Evidence depth

114 data points

Includes 25 benchmark rows, 0 audit samples, and 10 provider examples.

Selection signal

Start with Claude Sonnet 4.6

The charts below split 35 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 Sonnet 4.6 and GPT-5.1: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.

Model compare
Claude Sonnet 4.6
GPT-5.1
Overall leaderLeadingContender
Weighted overall score52.0 pts48.0 pts
Benchmark category leads3 categories3 categories
Operational advantagesCheapest input price, Free providers, Provider coverageAverage 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 Sonnet 4.6
GPT-5.1
DeveloperAnthropicOpenAI
ReleasedFeb 2026Nov 2025
ParametersNo dataNo data
TokenizerClaudeGPT
Knowledge cutoffNo dataNo data
OpenRouter IDanthropic/claude-sonnet-4.6openai/gpt-5.1
ReferencesNo dataNo data

When to choose each model

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

Claude Sonnet 4.6

Claude Sonnet 4.6 is stronger in benchmark categories (Agents, Coding, Knowledge) and operational dimensions (Cheapest input price, Free providers, Provider coverage).

GPT-5.1

GPT-5.1 is stronger in benchmark categories (Reasoning, Math, Instruction following) and operational dimensions (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
7 / 8
Model B coverage
6 / 8
Shared
6 shared categories

Avg. score

Claude Sonnet 4.6

53.1

Avg. score

GPT-5.1

51.9

Agents

Claude Sonnet 4.6 leads by 5.0

Claude Sonnet 4.652.7
GPT-5.147.7

Coding

Claude Sonnet 4.6 leads by 6.8

Claude Sonnet 4.655.9
GPT-5.149.1

Reasoning

GPT-5.1 leads by 4.2

Claude Sonnet 4.649.8
GPT-5.154

Knowledge

Claude Sonnet 4.6 leads by 17.6

Claude Sonnet 4.670.6
GPT-5.153

Math

GPT-5.1 leads by 0.8

Claude Sonnet 4.653.2
GPT-5.154

Multilingual

No data

Claude Sonnet 4.6-
GPT-5.1-

Multimodal

Claude Sonnet 4.6

Claude Sonnet 4.645.7
GPT-5.1-

Instruction following

GPT-5.1 leads by 9.8

Claude Sonnet 4.643.7
GPT-5.153.5

Professional benchmark details

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

Aggregatereported

BenchLM overall score

SourceClaude Sonnet 4.6

Claude Sonnet 4.6

winner

59.0

Rank #39/100 · confidence 3 · eval date 2026-02-01

+3.0

GPT-5.1

56.0

Rank #50/100 · confidence 1 · eval date 2025-11-13

Pricingverified

Input price

SourceClaude Sonnet 4.6 (Adaptive Reasoning, Max Effort)

Claude Sonnet 4.6

$3.00/M

Rank #155/180 · confidence 4

+$1.75/M

GPT-5.1

winner

$1.25/M

Rank #119/180 · confidence 4

Pricingverified

Blended price

SourceClaude Sonnet 4.6 (Adaptive Reasoning, Max Effort)

Claude Sonnet 4.6

$6.00/M

Rank #155/180 · confidence 4

+$2.56/M

GPT-5.1

winner

$3.44/M

Rank #135/180 · confidence 4

Pricingverified

Output price

SourceClaude Sonnet 4.6 (Adaptive Reasoning, Max Effort)

Claude Sonnet 4.6

$15.00/M

Rank #155/180 · confidence 4

+$5.00/M

GPT-5.1

winner

$10.00/M

Rank #138/180 · confidence 4

Reasoningreported

AA-LCR

SourceClaude Sonnet 4.6

Claude Sonnet 4.6

62.3

Rank #73/100 · confidence 3 · eval date 2026-02-01

+14.4

GPT-5.1

winner

76.7

Rank #19/100 · confidence 1 · eval date 2025-11-13

Reasoningreported

CritPt

SourceClaude Sonnet 4.6

Claude Sonnet 4.6

0.9

Rank #70/83 · confidence 3 · eval date 2026-02-01

+4.0

GPT-5.1

winner

4.9

Rank #43/83 · confidence 1 · eval date 2025-11-13

Reasoningverified

HLE

SourceClaude Sonnet 4.6 (Adaptive Reasoning, Max Effort)

Claude Sonnet 4.6

winner

33.6%

Rank #44/209 · confidence 4

+5.1%

GPT-5.1

28.5%

Rank #56/209 · confidence 4

Reasoningverified

GPQA

SourceClaude Sonnet 4.6 (Adaptive Reasoning, Max Effort)

Claude Sonnet 4.6

winner

87.5%

Rank #46/212 · confidence 4

+0.2%

GPT-5.1

87.3%

Rank #48/212 · confidence 4

Reasoningreported

MMLU-Pro

SourceClaude Sonnet 4.6

Claude Sonnet 4.6

79.2%

Rank #69/129 · confidence 3 · eval date 2026-02-01

+0.9%

GPT-5.1

winner

80.1%

Rank #62/129 · confidence 4

Codingreported

Vibe Code Bench

SourceClaude Sonnet 4.6

Claude Sonnet 4.6

winner

51.5

Rank #7/33 · confidence 3 · eval date 2026-02-01

+26.9

GPT-5.1

24.6

Rank #18/33 · confidence 1 · eval date 2025-11-13

Codingverified

SciCode

SourceClaude Sonnet 4.6 (Adaptive Reasoning, Max Effort)

Claude Sonnet 4.6

winner

46.8%

Rank #39/205 · confidence 4

+3.5%

GPT-5.1

43.3%

Rank #56/205 · confidence 4

Codingreported

AA-SciCode

SourceClaude Sonnet 4.6

Claude Sonnet 4.6

winner

46.9

Rank #42/108 · confidence 3 · eval date 2026-02-01

+3.6

GPT-5.1

43.3

Rank #55/108 · confidence 1 · eval date 2025-11-13

Mathreported

FrontierMath v2 (Tier 4)

SourceClaude Sonnet 4.6

Claude Sonnet 4.6

8.3

Rank #19/35 · confidence 3 · eval date 2026-02-01

+4.2

GPT-5.1

winner

12.5

Rank #16/35 · confidence 1 · eval date 2025-11-13

Mathreported

FrontierMath v2 (Tiers 1-3)

SourceClaude Sonnet 4.6

Claude Sonnet 4.6

winner

32.4

Rank #18/47 · confidence 3 · eval date 2026-02-01

+1.4

GPT-5.1

31.0

Rank #19/47 · confidence 1 · eval date 2025-11-13

Mathreported

BenchLM Math score

SourceClaude Sonnet 4.6

Claude Sonnet 4.6

49.4

Rank #37/62 · confidence 3 · eval date 2026-02-01

+0.3

GPT-5.1

winner

49.7

Rank #36/62 · confidence 1 · eval date 2025-11-13

Knowledgereported

AA-Omniscience Accuracy

SourceClaude Sonnet 4.6

Claude Sonnet 4.6

winner

38.6

Rank #36/101 · confidence 3 · eval date 2026-02-01

+0.9

GPT-5.1

37.7

Rank #39/101 · confidence 1 · eval date 2025-11-13

Knowledgereported

AA-GPQA Diamond

SourceClaude Sonnet 4.6

Claude Sonnet 4.6

79.9

Rank #74/108 · confidence 3 · eval date 2026-02-01

+7.4

GPT-5.1

winner

87.3

Rank #44/108 · confidence 1 · eval date 2025-11-13

Knowledgereported

AA-HLE

SourceClaude Sonnet 4.6

Claude Sonnet 4.6

13.3

Rank #76/108 · confidence 3 · eval date 2026-02-01

+15.2

GPT-5.1

winner

28.5

Rank #47/108 · confidence 1 · eval date 2025-11-13

Knowledgereported

Artificial Analysis Intelligence Index

SourceClaude Sonnet 4.6

Claude Sonnet 4.6

36.8

Rank #54/111 · confidence 3 · eval date 2026-02-01

+0.7

GPT-5.1

winner

37.5

Rank #52/111 · confidence 1 · eval date 2025-11-13

Knowledgereported

AA-Omniscience Hallucination Rate

SourceClaude Sonnet 4.6

Claude Sonnet 4.6

winner

68.5

Rank #56/101 · confidence 3 · eval date 2026-02-01

+16.6

GPT-5.1

51.9

Rank #72/101 · confidence 1 · eval date 2025-11-13

Multimodalreported

Design Arena Website

SourceClaude Sonnet 4.6

Claude Sonnet 4.6

winner

1305.0

Rank #12/75 · confidence 3 · eval date 2026-02-01

+107.0

GPT-5.1

1198.0

Rank #48/75 · confidence 1 · eval date 2025-11-13

Multimodalreported

AA-MMMU-Pro

SourceClaude Sonnet 4.6

Claude Sonnet 4.6

70.6

Rank #47/65 · confidence 3 · eval date 2026-02-01

+4.9

GPT-5.1

winner

75.5

Rank #28/65 · confidence 1 · eval date 2025-11-13

Instruction followingreported

AA-IFBench

SourceClaude Sonnet 4.6

Claude Sonnet 4.6

41.2

Rank #67/84 · confidence 3 · eval date 2026-02-01

+31.7

GPT-5.1

winner

72.9

Rank #28/84 · confidence 1 · eval date 2025-11-13

Agentsreported

Gert Labs

SourceClaude Sonnet 4.6

Claude Sonnet 4.6

winner

62.9

Rank #8/49 · confidence 3 · eval date 2026-02-01

+21.7

GPT-5.1

41.2

Rank #34/49 · confidence 1 · eval date 2025-11-13

Agentsreported

τ²-bench results

SourceClaude Sonnet 4.6

Claude Sonnet 4.6

79.5

Rank #55/82 · confidence 3 · eval date 2026-02-01

+2.4

GPT-5.1

winner

81.9

Rank #53/82 · confidence 1 · 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 Sonnet 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 Sonnet 4.6
GPT-5.1
天宫造物25 tests

Claude Sonnet 4.6

speed / latency

40 tok/s / 3145ms

input / output

No data

GPT-5.1

speed / latency

N/A / N/A

input / output

No data

巨量API14 tests

Claude Sonnet 4.6

speed / latency

39 tok/s / 5723ms

input / output

No data

GPT-5.1

speed / latency

139 tok/s / 1654ms

input / output

No data

BUZZ10 tests

Claude Sonnet 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 Sonnet 4.6

speed / latency

41 tok/s / 3714ms

input / output

No data

GPT-5.1

speed / latency

N/A / N/A

input / output

No data

N1N10 tests

Claude Sonnet 4.6

speed / latency

55 tok/s / 2094ms

input / output

No data

GPT-5.1

speed / latency

96 tok/s / 1862ms

input / output

No data

兔子API

Claude Sonnet 4.6

claude-sonnet-4-6

speed / latency

No data

input / output

$0/request

GPT-5.1

gpt-5.1-chat-latest

speed / latency

No data

input / output

$0/request

初叶🍂Furry API

Claude Sonnet 4.6

claude-sonnet-4-6

speed / latency

No data

input / output

$0.050/request

GPT-5.1

gpt-5-1

speed / latency

No data

input / output

$0/request

Yun API

Claude Sonnet 4.6

claude-sonnet-4-6

speed / latency

No data

input / output

$0.205/M/$1.03/M

GPT-5.1

gpt-5.1

speed / latency

No data

input / output

$0.0027/request

KFCV50

Claude Sonnet 4.6

claude-sonnet-4-6

speed / latency

No data

input / output

$0.010/request

GPT-5.1

gpt-5.1

speed / latency

No data

input / output

$0.0068/request

PoloAPI

Claude Sonnet 4.6

claude-sonnet-4-6-c

speed / latency

No data

input / output

$0.0082/request

GPT-5.1

gpt-5.1-chat-2025-11-13

speed / latency

No data

input / output

$0.137/M/$1.10/M

FAQ

Weighted outcome: Claude Sonnet 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.