Data points: 82
The readout for Claude Opus 4 and Claude Sonnet 4.5, before the detailed comparison sheet.
Decision read
Claude Sonnet 4.5
Claude Sonnet 4.5 currently has the stronger profile, with verified wins split 0 to 6.
Evidence depth
82 data points
Includes 8 benchmark rows, 0 audit samples, and 9 provider examples.
Selection signal
Start with Claude Sonnet 4.5
The charts below split 17 high-signal samples across speed, scores, and audit health.
Model compare Claude Opus 4 vs Claude Sonnet 4.5claude-opus-4-vs-claude-sonnet-4-5 | Model A Claude Opus 4 | Model B Claude Sonnet 4.5 |
|---|---|---|
| Overall leader | Contender | Leading |
| Verified metric wins | 0 wins | 6 wins |
| Where it leads | No data | 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 Opus 4 | Claude Sonnet 4.5 |
|---|---|---|
| MMLU-Pro | 86.0%#13 |
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | Claude Opus 4 | Claude Sonnet 4.5 |
|---|---|---|
| No completed audits are available from shared providers yet. | ||
Speed aggregates and input/output pricing share each provider row for real API selection and migration cost checks.
| Provider | Claude Opus 4 | Claude Sonnet 4.5 |
|---|---|---|
10 tests | Claude Opus 4 speed / latency N/A / N/A input / output No data |
This report only uses LMSpeed data for Claude Opus 4 and Claude Sonnet 4.5: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Guidance | Claude Opus 4 | Claude Sonnet 4.5 |
|---|---|---|
| When to choose each model | Claude Opus 4 Claude Opus 4 does not clearly lead on the verified metrics here, so check provider-specific pricing before choosing. | Claude Sonnet 4.5 Claude Sonnet 4.5 is stronger when you prioritize Cheapest input price, Average speed, First-token latency, Free providers, Provider coverage, Recent tests. |
TL;DR: Claude Sonnet 4.5 leads across 82 verifiable data points, including pricing, speed, latency, benchmarks, and provider examples.
Continue from Claude Opus 4 vs Claude Sonnet 4.5 into nearby model comparisons with enough verified LMSpeed data.
| Model metadata | Claude Opus 4 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 | 32K tokens | 64K tokens |
| Released | May 2025 | Sep 2025 |
| Modalities | Input ImageTextFile Output Text | Input TextImageFile Output Text |
| Features | Text inputImage inputFile inputText outputTool callingReasoning | Text inputImage inputFile inputText outputTool callingStructured outputsJSON modeReasoning |
| Parameters | No data | No data |
| Tokenizer | Claude | Claude |
| Knowledge cutoff | 2025-01-31 | 2025-01-31 |
| OpenRouter ID | anthropic/claude-opus-4 | anthropic/claude-sonnet-4.5 |
| References | No data | No data |
| SciCode | 40.9%#41 | 42.8%#32 |
|---|
| Time to first answer token | 1.87 s#41 | 1.55 s#37 |
|---|
| Input price | $15.00/M#43 | $3.00/M#39 |
|---|
| LiveCodeBench | 54.2%#52 | 59.0%#44 |
|---|
| Output price | $75.00/M#52 | $15.00/M#44 |
|---|
| Time to first token | 1.87 s#68 | 1.55 s#60 |
|---|
| Blended price | $30.00/M#73 | $6.00/M#65 |
|---|
Claude Sonnet 4.5
speed / latency
41 tok/s / 3271ms
input / output
No data
天宫造物10 tests | Claude Opus 4 speed / latency N/A / N/A input / output No data | Claude Sonnet 4.5 speed / latency 45 tok/s / 3170ms input / output No data |
|---|
EasyMore5 tests | Claude Opus 4 speed / latency N/A / N/A input / output No data | Claude Sonnet 4.5 speed / latency 29 tok/s / 9801ms input / output No data |
|---|
180txt API0 tests | Claude Opus 4 speed / latency N/A / N/A input / output No data | Claude Sonnet 4.5 speed / latency N/A / N/A input / output No data |
|---|
6345ywz API0 tests | Claude Opus 4 speed / latency N/A / N/A input / output No data | Claude Sonnet 4.5 speed / latency N/A / N/A input / output No data |
|---|
Claude Opus 4 claude-opus-4-20250514 speed / latency No data input / output $0.205/M / $1.03/M | Claude Sonnet 4.5 claude-sonnet-4-5-20250929 speed / latency No data input / output $0.041/M / $0.205/M |
Claude Opus 4 claude-opus-4-20250514 speed / latency No data input / output $0.342/M / $1.71/M | Claude Sonnet 4.5 claude-sonnet-4-5-20250929 speed / latency No data input / output $0.205/M / $1.03/M |
Claude Opus 4 claude-opus-4-20250514 speed / latency No data input / output $1.29/M / $6.43/M | Claude Sonnet 4.5 claude-sonnet-4-5-20250929 speed / latency No data input / output $0.257/M / $1.29/M |
Claude Opus 4 claude-opus-4-20250514 speed / latency No data input / output $1.80/M / $9.00/M | Claude Sonnet 4.5 claude-sonnet-4-5-20250929 speed / latency No data input / output $0.360/M / $1.80/M |
Rankings are based on community-submitted tests and periodic health probes. Advisory only, not official data.
