Data points: 91
The readout for Claude Haiku 4.5 and Claude Sonnet 4.5, before the detailed comparison sheet.
Decision read
Claude Haiku 4.5
Claude Haiku 4.5 currently has the stronger profile, with verified wins split 6 to 0.
Evidence depth
91 data points
Includes 8 benchmark rows, 1 audit samples, and 10 provider examples.
Selection signal
Start with Claude Haiku 4.5
The charts below split 19 high-signal samples across speed, scores, and audit health.
Model compare Claude Haiku 4.5 vs Claude Sonnet 4.5claude-haiku-4-5-vs-claude-sonnet-4-5 | Model A Claude Haiku 4.5 | Model B Claude Sonnet 4.5 |
|---|---|---|
| Overall leader | Leading | Contender |
| Verified metric wins | 6 wins | 0 wins |
| Where it leads | Cheapest input price, Average speed, First-token latency, Free providers, Provider coverage, Recent tests |
Third-party benchmark profile synced into LMSpeed; only metrics available for both models are shown.
| Metric | Claude Haiku 4.5 | Claude Sonnet 4.5 |
|---|---|---|
| MMLU-Pro | 80.0%#40 |
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | Claude Haiku 4.5 | Claude Sonnet 4.5 |
|---|---|---|
Winner: Claude Sonnet 4.5 | Claude Haiku 4.5 claude-haiku-4.5 Audit score 84 64 |
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 4.5 |
|---|---|---|
15 tests | Claude Haiku 4.5 speed / latency 112 tok/s / 1733ms input / output No data |
This report only uses LMSpeed data for Claude Haiku 4.5 and Claude Sonnet 4.5: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Guidance | Claude Haiku 4.5 | Claude Sonnet 4.5 |
|---|---|---|
| When to choose each model | Claude Haiku 4.5 Claude Haiku 4.5 is stronger when you prioritize Cheapest input price, Average speed, First-token latency, Free providers, Provider coverage, Recent tests. | Claude Sonnet 4.5 Claude Sonnet 4.5 does not clearly lead on the verified metrics here, so check provider-specific pricing before choosing. |
TL;DR: Claude Haiku 4.5 leads across 91 verifiable data points, including pricing, speed, latency, benchmarks, and provider examples.
Continue from Claude Haiku 4.5 vs Claude Sonnet 4.5 into nearby model comparisons with enough verified LMSpeed data.
| No data |
| Model metadata | Claude Haiku 4.5 exposes 200K tokens; notable signals: Text input, Image input, File input, Text output. | Claude Sonnet 4.5 exposes 1M tokens; notable signals: Text input, Image input, File input, Text output. |
|---|---|---|
| Developer | Anthropic | Anthropic |
| Context window | 200K tokens | 1M tokens |
| Max output | 64K tokens | 64K tokens |
| Released | Oct 2025 | Sep 2025 |
| Modalities | Input TextImageFile Output Text | Input TextImageFile Output Text |
| Features | Text inputImage inputFile inputText outputTool callingStructured outputsJSON modeReasoning | Text inputImage inputFile inputText outputTool callingStructured outputsJSON mode |
| Parameters | No data | No data |
| Tokenizer | Claude | Claude |
| Knowledge cutoff | No data | 2025-01-31 |
| OpenRouter ID | anthropic/claude-haiku-4.5 | anthropic/claude-sonnet-4.5 |
| References | No data | No data |
| Time to first answer token | 0.90 s#22 | 1.55 s#37 |
|---|
| Input price | $1.00/M#26 | $3.00/M#39 |
|---|
| SciCode | 34.4%#78 | 42.8%#32 |
|---|
| Time to first token | 0.90 s#32 | 1.55 s#60 |
|---|
| Output price | $5.00/M#37 | $15.00/M#44 |
|---|
| LiveCodeBench | 51.1%#55 | 59.0%#44 |
|---|
| Output speed | 103.5 tok/s#48 | 47.9 tok/s#92 |
|---|
Claude Sonnet 4.5 claude-sonnet-4.5 Audit score 91 64100100100 |
Claude Sonnet 4.5
speed / latency
N/A / N/A
input / output
No data
Completions10 tests | Claude Haiku 4.5 speed / latency 21 tok/s / 1170ms input / output No data | Claude Sonnet 4.5 speed / latency 21 tok/s / 1085ms input / output No data |
|---|
Fangyuan API10 tests | Claude Haiku 4.5 speed / latency 88 tok/s / 2243ms input / output No data | Claude Sonnet 4.5 speed / latency N/A / N/A input / output No data |
|---|
YUNWU API10 tests | Claude Haiku 4.5 speed / latency N/A / N/A input / output No data | Claude Sonnet 4.5 speed / latency 41 tok/s / 3271ms input / output No data |
|---|
天宫造物10 tests | Claude Haiku 4.5 speed / latency N/A / N/A input / output No data | Claude Sonnet 4.5 speed / latency 45 tok/s / 3170ms input / output No data |
|---|
Claude Haiku 4.5 claude-haiku-4.5 speed / latency No data input / output $0/M / $0/M | Claude Sonnet 4.5 claude-sonnet-4.5 speed / latency No data input / output $0/M / $0/M |
Claude Haiku 4.5 claude-haiku-4.5 speed / latency No data input / output $0/M / $0/M | Claude Sonnet 4.5 claude-sonnet-4-5-20250929 speed / latency No data input / output $0.430/M / $2.15/M |
Claude Haiku 4.5 claude-haiku-4-5-20251001 speed / latency No data input / output $0.0003/M / $0.0014/M | Claude Sonnet 4.5 claude-sonnet-4-5-20250929 speed / latency No data input / output $0.0008/M / $0.0041/M |
Claude Haiku 4.5 claude-haiku-4-5-20251001 speed / latency No data input / output $0.014/M / $0.068/M | Claude Sonnet 4.5 claude-sonnet-4-5-20250929 speed / latency No data input / output $0.041/M / $0.205/M |
Claude Haiku 4.5 claude-haiku-4-5 speed / latency No data input / output $0.014/M / $0.014/M | Claude Sonnet 4.5 claude-sonnet-4-5 speed / latency No data input / output $0.020/M / $0.020/M |
Rankings are based on community-submitted tests and periodic health probes. Advisory only, not official data.
