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.

Back to models

Data points: 124

Model compare

Claude Haiku 4.5 vs Claude Sonnet 4.6

The readout for Claude Haiku 4.5 and Claude Sonnet 4.6, before the detailed comparison sheet.

Model A

Claude Haiku 4.5

Anthropic

Contender

vs

Model B

Claude Sonnet 4.6

Anthropic

Leading

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 16 to 84.

Evidence depth

124 data points

Includes 15 benchmark rows, 5 audit samples, and 7 provider examples.

Selection signal

Start with Claude Sonnet 4.6

The charts below split 27 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.

Model AModel B

Comparison sheet

This report only uses LMSpeed data for Claude Haiku 4.5 and Claude Sonnet 4.6: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.

Model compare	Claude Haiku 4.5	Claude Sonnet 4.6
Overall leader	Contender	Leading
Weighted overall score	16.0 pts	84.0 pts
Benchmark category leads	0 categories	4 categories
Operational advantages	Cheapest input price, Average speed, First-token latency, Free providers	Provider coverage
Context window	200K tokens	1M tokens
Max output	64K tokens	128K tokens
Modalities	Input TextImageFile Output Text

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	Claude Sonnet 4.6
Developer	Anthropic	Anthropic
Released	Oct 2025	Feb 2026
Parameters	No data	No data
Tokenizer	Claude	Claude
Knowledge cutoff	No data	No data
OpenRouter ID	anthropic/claude-haiku-4.5	anthropic/claude-sonnet-4.6
References	No data	No data

When to choose each model

This report only uses LMSpeed data for Claude Haiku 4.5 and Claude Sonnet 4.6: 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, Average speed, First-token latency, Free providers.

Claude Sonnet 4.6

Claude Sonnet 4.6 is stronger in benchmark categories (Agents, Coding, Reasoning, Math) and operational dimensions (Provider coverage).

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: 7 / 8
Shared: 4 shared categories

Avg. score

Claude Haiku 4.5

45.9

Avg. score

Claude Sonnet 4.6

53.2

Agents

Claude Sonnet 4.6 leads by 10.7

Claude Haiku 4.543

Claude Sonnet 4.653.7

Coding

Claude Sonnet 4.6 leads by 9.3

Claude Haiku 4.546.9

Claude Sonnet 4.656.2

Reasoning

Claude Sonnet 4.6 leads by 2.3

Claude Haiku 4.5

Professional benchmark details

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

Group

Aggregatereported

BenchLM overall score

SourceClaude Haiku 4.5

Claude Haiku 4.5

53.0

Rank #50/84 · confidence 1 · eval date 2025-10-15

+10.0

Claude Sonnet 4.6

winner

63.0

Rank #25/84 · confidence 3 · eval date 2026-02-01

Pricingverified

Input price

SourceClaude 4.5 Haiku (Non-reasoning)

Claude Haiku 4.5

winner

$1.00/M

Rank #98/162 · confidence 4

+$2.00/M

Claude Sonnet 4.6

$3.00/M

Rank #137/162 · confidence 4

Pricingverified

Blended price

SourceClaude 4.5 Haiku (Non-reasoning)

Claude Haiku 4.5

winner

$2.00/M

Rank #101/162 · confidence 4

+$4.00/M

Claude Sonnet 4.6

$6.00/M

Rank #137/162 · confidence 4

Pricingverified

Output price

SourceClaude 4.5 Haiku (Non-reasoning)

Claude Haiku 4.5

winner

$5.00/M

Rank #104/162 · confidence 4

+$10.00/M

Claude Sonnet 4.6

$15.00/M

Rank #136/162 · confidence 4

Reasoningverified

GPQA

SourceClaude 4.5 Haiku (Non-reasoning)

Claude Haiku 4.5

64.6%

Rank #131/188 · confidence 4

+22.9%

Claude Sonnet 4.6

winner

87.5%

Rank #31/188 · confidence 4

Reasoningverified

HLE

SourceClaude 4.5 Haiku (Non-reasoning)

Claude Haiku 4.5

4.3%

Rank #150/187 · confidence 4

+25.7%

Claude Sonnet 4.6

winner

30.0%

Rank #31/187 · confidence 4

Reasoningverified

MMLU-Pro

SourceClaude 4.5 Haiku (Non-reasoning)

Claude Haiku 4.5

winner

80.0%

Rank #61/125 · confidence 4

+0.8%

Claude Sonnet 4.6

79.2%

Rank #68/125 · confidence 3 · eval date 2026-02-01

Codingreported

BenchLM Coding score

SourceClaude Haiku 4.5

Claude Haiku 4.5

49.2

Rank #43/65 · confidence 1 · eval date 2025-10-15

+14.5

Claude Sonnet 4.6

winner

63.7

Rank #8/65 · confidence 3 · eval date 2026-02-01

Codingreported

SWE-bench Verified

SourceClaude Haiku 4.5

Claude Haiku 4.5

73.3

Rank #32/43 · confidence 1 · eval date 2025-10-15

+6.3

Claude Sonnet 4.6

winner

79.6

Rank #13/43 · confidence 3 · eval date 2026-02-01

Codingverified

SciCode

SourceClaude 4.5 Haiku (Non-reasoning)

Claude Haiku 4.5

34.4%

Rank #115/185 · confidence 4

+12.4%

Claude Sonnet 4.6

winner

46.8%

Rank #29/185 · confidence 4

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

+26.5

Claude Sonnet 4.6

winner

32.4

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

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

+6.2

Claude Sonnet 4.6

winner

8.3

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

Mathreported

BenchLM Math score

SourceClaude Haiku 4.5

Claude Haiku 4.5

29.2

Rank #43/56 · confidence 1 · eval date 2025-10-15

+20.3

Claude Sonnet 4.6

winner

49.5

Rank #31/56 · confidence 3 · eval date 2026-02-01

Multimodalreported

Design Arena Website

SourceClaude Haiku 4.5

Claude Haiku 4.5

1147.0

Rank #51/66 · confidence 1 · eval date 2025-10-15

+163.0

Claude Sonnet 4.6

winner

1310.0

Rank #9/66 · confidence 3 · eval date 2026-02-01

Agentsreported

JobBench

SourceClaude Haiku 4.5

Claude Haiku 4.5

16.0

Rank #16/20 · confidence 1 · eval date 2025-10-15

+20.9

Claude Sonnet 4.6

winner

36.9

Rank #5/20 · confidence 3 · eval date 2026-02-01

API audit comparison

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

Provider	Claude Haiku 4.5	Claude Sonnet 4.6
Winner: Claude Sonnet 4.6	Claude Haiku 4.5 claude-haiku-4-5-20251001 No audit yet	Claude Sonnet 4.6 claude-sonnet-4-6 Audit score 94 76100100100
Winner: Tie	Claude Haiku 4.5 claude-haiku-4-5 Audit score 94 76100100100	Claude Sonnet 4.6 claude-sonnet-4-6 Audit score 94 76
Winner: Claude Sonnet 4.6	Claude Haiku 4.5 claude-haiku-4-5-20251001 No audit yet	Claude Sonnet 4.6 claude-sonnet-4-6 Audit score 91 64100100100
Winner: Claude Sonnet 4.6	Claude Haiku 4.5 claude-haiku-4-5-20251001 No audit yet	Claude Sonnet 4.6 claude-sonnet-4-6 Audit score 89 56100100100
Winner: Claude Haiku 4.5	Claude Haiku 4.5 claude-haiku-4.5 Audit score 84 648410088	Claude Sonnet 4.6 claude-sonnet-4.6 No audit 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	Claude Sonnet 4.6
30 tests	Claude Haiku 4.5 speed / latency 97 tok/s / 1336ms input / output No data	Claude Sonnet 4.6 speed / latency 32 tok/s / 6074ms input / output No data
25 tests	Claude Haiku 4.5 speed / latency N/A / N/A input / output No data	Claude Sonnet 4.6 speed / latency 40 tok/s / 3145ms input / output No data
20 tests	Claude Haiku 4.5 speed / latency 112 tok/s / 1733ms input / output No data	Claude Sonnet 4.6 speed / latency 55 tok/s / 2094ms input / output No data
15 tests	Claude Haiku 4.5 speed / latency 139 tok/s / 12443ms input / output No data	Claude Sonnet 4.6 speed / latency 31 tok/s / 4124ms input / output No data
10 tests	Claude Haiku 4.5 speed / latency 88 tok/s / 2243ms input / output No data	Claude Sonnet 4.6 speed / latency N/A / N/A input / output No data
	Claude Haiku 4.5 claude-haiku-4-5-20251001 speed / latency No data input / output $0/M/$0/M	Claude Sonnet 4.6 claude-sonnet-4-6 speed / latency No data input / output $0/M
	Claude Haiku 4.5 claude-haiku-4-5-20251001 speed / latency No data input / output $0/request	Claude Sonnet 4.6 claude-sonnet-4-6 speed / latency No data input / output $0/request

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.

Input

TextImageFile

Output

Text

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