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Model compare

Claude Haiku 4.5 vs GPT-5.1

The readout for Claude Haiku 4.5 and GPT-5.1, before the detailed comparison sheet.

Model A

Claude Haiku 4.5

Anthropic

Contender
vs

Model B

GPT-5.1

OpenAI

Leading

Key Takeaways

Weighted outcome: GPT-5.1. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.

Decision read

GPT-5.1

GPT-5.1 has the higher weighted result; Model A / B score 16 to 84.

Evidence depth

90 data points

Includes 13 benchmark rows, 0 audit samples, and 10 provider examples.

Selection signal

Start with GPT-5.1

The charts below split 23 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 Haiku 4.5 and GPT-5.1: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.

Model compare
Claude Haiku 4.5
GPT-5.1
Overall leaderContenderLeading
Weighted overall score16.0 pts84.0 pts
Benchmark category leads0 categories4 categories
Operational advantagesCheapest input price, First-token latency, Free providers, Provider coverageAverage speed
Context window200K tokens400K tokens
Max output64K 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 Haiku 4.5
GPT-5.1
DeveloperAnthropicOpenAI
ReleasedOct 2025Nov 2025
ParametersNo dataNo data
TokenizerClaudeGPT
Knowledge cutoffNo dataNo data
OpenRouter IDanthropic/claude-haiku-4.5openai/gpt-5.1
ReferencesNo dataNo data

When to choose each model

This report only uses LMSpeed data for Claude Haiku 4.5 and GPT-5.1: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.

Claude Haiku 4.5

Claude Haiku 4.5 has these operational advantages: Cheapest input price, First-token latency, Free providers, Provider coverage.

GPT-5.1

GPT-5.1 is stronger in benchmark categories (Agents, Coding, Reasoning, Math) and operational dimensions (Average speed).

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
4 / 8
Model B coverage
6 / 8
Shared
4 shared categories

Avg. score

Claude Haiku 4.5

45.6

Avg. score

GPT-5.1

51.9

Agents

GPT-5.1 leads by 5.2

Claude Haiku 4.542.5
GPT-5.147.7

Coding

GPT-5.1 leads by 2.6

Claude Haiku 4.546.5
GPT-5.149.1

Reasoning

GPT-5.1 leads by 6.5

Claude Haiku 4.547.5
GPT-5.154

Knowledge

GPT-5.1

Claude Haiku 4.5-
GPT-5.153

Math

GPT-5.1 leads by 8.3

Claude Haiku 4.545.7
GPT-5.154

Multilingual

No data

Claude Haiku 4.5-
GPT-5.1-

Multimodal

No data

Claude Haiku 4.5-
GPT-5.1-

Instruction following

GPT-5.1

Claude Haiku 4.5-
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 Haiku 4.5

Claude Haiku 4.5

55.0

Rank #55/100 · confidence 1 · eval date 2025-10-15

+1.0

GPT-5.1

winner

56.0

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

Pricingverified

Input price

SourceClaude 4.5 Haiku (Non-reasoning)

Claude Haiku 4.5

winner

$1.00/M

Rank #110/180 · confidence 4

+$0.250/M

GPT-5.1

$1.25/M

Rank #119/180 · confidence 4

Pricingverified

Blended price

SourceClaude 4.5 Haiku (Non-reasoning)

Claude Haiku 4.5

winner

$2.00/M

Rank #118/180 · confidence 4

+$1.44/M

GPT-5.1

$3.44/M

Rank #135/180 · confidence 4

Pricingverified

Output price

SourceClaude 4.5 Haiku (Non-reasoning)

Claude Haiku 4.5

winner

$5.00/M

Rank #123/180 · confidence 4

+$5.00/M

GPT-5.1

$10.00/M

Rank #138/180 · confidence 4

Reasoningverified

GPQA

SourceClaude 4.5 Haiku (Non-reasoning)

Claude Haiku 4.5

64.6%

Rank #153/212 · confidence 4

+22.7%

GPT-5.1

winner

87.3%

Rank #48/212 · confidence 4

Reasoningverified

HLE

SourceClaude 4.5 Haiku (Non-reasoning)

Claude Haiku 4.5

4.2%

Rank #170/209 · confidence 4

+24.3%

GPT-5.1

winner

28.5%

Rank #56/209 · confidence 4

Reasoningverified

MMLU-Pro

SourceClaude 4.5 Haiku (Non-reasoning)

Claude Haiku 4.5

80.0%

Rank #63/129 · confidence 4

+0.1%

GPT-5.1

winner

80.1%

Rank #62/129 · confidence 4

Codingverified

LiveCodeBench

SourceClaude 4.5 Haiku (Non-reasoning)

Claude Haiku 4.5

51.1%

Rank #59/115 · confidence 4

+35.7%

GPT-5.1

winner

86.8%

Rank #4/115 · confidence 4

Codingverified

SciCode

SourceClaude 4.5 Haiku (Non-reasoning)

Claude Haiku 4.5

34.4%

Rank #133/205 · confidence 4

+8.9%

GPT-5.1

winner

43.3%

Rank #56/205 · confidence 4

Mathreported

FrontierMath v2 (Tier 4)

SourceClaude Haiku 4.5

Claude Haiku 4.5

2.1

Rank #32/35 · confidence 1 · eval date 2025-10-15

+10.4

GPT-5.1

winner

12.5

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

Mathreported

FrontierMath v2 (Tiers 1-3)

SourceClaude Haiku 4.5

Claude Haiku 4.5

5.9

Rank #36/47 · confidence 1 · eval date 2025-10-15

+25.1

GPT-5.1

winner

31.0

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

Mathreported

BenchLM Math score

SourceClaude Haiku 4.5

Claude Haiku 4.5

29.0

Rank #49/62 · confidence 1 · eval date 2025-10-15

+20.7

GPT-5.1

winner

49.7

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

Multimodalreported

Design Arena Website

SourceClaude Haiku 4.5

Claude Haiku 4.5

1133.0

Rank #62/75 · confidence 1 · eval date 2025-10-15

+65.0

GPT-5.1

winner

1198.0

Rank #48/75 · 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 Haiku 4.5
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 Haiku 4.5
GPT-5.1
N1N20 tests

Claude Haiku 4.5

speed / latency

112 tok/s / 1733ms

input / output

No data

GPT-5.1

speed / latency

96 tok/s / 1862ms

input / output

No data

BUZZ10 tests

Claude Haiku 4.5

speed / latency

N/A / N/A

input / output

No data

GPT-5.1

speed / latency

137 tok/s / 3299ms

input / output

No data

发现AI10 tests

Claude Haiku 4.5

speed / latency

68 tok/s / 4647ms

input / output

No data

GPT-5.1

speed / latency

N/A / N/A

input / output

No data

Completions5 tests

Claude Haiku 4.5

speed / latency

21 tok/s / 1170ms

input / output

No data

GPT-5.1

speed / latency

N/A / N/A

input / output

No data

My Claude Code5 tests

Claude Haiku 4.5

speed / latency

109 tok/s / 2221ms

input / output

No data

GPT-5.1

speed / latency

N/A / N/A

input / output

No data

兔子API

Claude Haiku 4.5

claude-haiku-4-5-20251001

speed / latency

No data

input / output

$0/request

GPT-5.1

gpt-5.1-chat-latest

speed / latency

No data

input / output

$0/request

Yun API

Claude Haiku 4.5

claude-haiku-4-5-20251001

speed / latency

No data

input / output

$0.068/M/$0.342/M

GPT-5.1

gpt-5.1

speed / latency

No data

input / output

$0.0027/request

Gpt API

Claude Haiku 4.5

claude-haiku-4-5-20251001

speed / latency

No data

input / output

$0.0029/M/$0.014/M

GPT-5.1

gpt-5.1-high

speed / latency

No data

input / output

$0.179/M/$1.43/M

KFCV50

Claude Haiku 4.5

claude-haiku-4-5-20251001

speed / latency

No data

input / output

$0.034/M/$0.171/M

GPT-5.1

gpt-5.1

speed / latency

No data

input / output

$0.0068/request

PoloAPI

Claude Haiku 4.5

claude-haiku-4-5-c

speed / latency

No data

input / output

$0.0068/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: GPT-5.1. 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.