Data points: 82
The readout for Claude Sonnet 4.5 and GPT-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 5 to 1.
Evidence depth
82 data points
Includes 8 benchmark rows, 0 audit samples, and 10 provider examples.
Selection signal
Start with Claude Sonnet 4.5
The charts below split 18 high-signal samples across speed, scores, and audit health.
Model compare Claude Sonnet 4.5 vs GPT-5claude-sonnet-4-5-vs-gpt-5 | Model A Claude Sonnet 4.5 | Model B GPT-5 |
|---|---|---|
| Overall leader | Leading | Contender |
| Verified metric wins | 5 wins | 1 wins |
| Where it leads | Cheapest input price, 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 Sonnet 4.5 | GPT-5 |
|---|---|---|
| MMLU-Pro | 86.0%#13 |
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | Claude Sonnet 4.5 | GPT-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 Sonnet 4.5 | GPT-5 |
|---|---|---|
20 tests | Claude Sonnet 4.5 speed / latency 46 tok/s / 5111ms input / output No data |
This report only uses LMSpeed data for Claude Sonnet 4.5 and GPT-5: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Guidance | Claude Sonnet 4.5 | GPT-5 |
|---|---|---|
| When to choose each model | Claude Sonnet 4.5 Claude Sonnet 4.5 is stronger when you prioritize Cheapest input price, First-token latency, Free providers, Provider coverage, Recent tests. | GPT-5 GPT-5 is stronger when you prioritize Average speed. |
TL;DR: Claude Sonnet 4.5 leads across 82 verifiable data points, including pricing, speed, latency, benchmarks, and provider examples.
Continue from Claude Sonnet 4.5 vs GPT-5 into nearby model comparisons with enough verified LMSpeed data.
| Average speed |
| Model metadata | Claude Sonnet 4.5 exposes 1M tokens; notable signals: Text input, Image input, File input, Text output. | GPT-5 exposes 128K tokens; notable signals: Text input, Image input, File input, Text output. |
|---|---|---|
| Developer | Anthropic | OpenAI |
| Context window | 1M tokens | 128K tokens |
| Max output | 64K tokens | 16.4K tokens |
| Released | Sep 2025 | Aug 2025 |
| Modalities | Input TextImageFile Output Text | Input FileImageText Output Text |
| Features | Text inputImage inputFile inputText outputTool callingStructured outputsJSON modeReasoning | Text inputImage inputFile inputText outputStructured outputsJSON mode |
| Parameters | No data | No data |
| Tokenizer | Claude | GPT |
| Knowledge cutoff | 2025-01-31 | 2024-09-30 |
| OpenRouter ID | anthropic/claude-sonnet-4.5 | openai/gpt-5-chat |
| References | No data | No data |
| LiveCodeBench | 59.0%#44 | 84.6%#11 |
|---|
| HLE | 7.1%#77 | 26.5%#24 |
|---|
| Input price | $3.00/M#39 | $1.25/M#30 |
|---|
| GPQA | 72.7%#75 | 85.4%#31 |
|---|
| SciCode | 42.8%#32 | 42.9%#31 |
|---|
| Time to first answer token | 1.55 s#37 | 62.85 s#98 |
|---|
| Output price | $15.00/M#44 | $10.00/M#41 |
|---|
GPT-5
speed / latency
45 tok/s / 3704ms
input / output
No data
V-API20 tests | Claude Sonnet 4.5 speed / latency N/A / N/A input / output No data | GPT-5 speed / latency 95 tok/s / 1234ms input / output No data |
|---|
巨量API12 tests | Claude Sonnet 4.5 speed / latency 17 tok/s / 9739ms input / output No data | GPT-5 speed / latency N/A / N/A input / output No data |
|---|
EasyMore10 tests | Claude Sonnet 4.5 speed / latency 29 tok/s / 9801ms input / output No data | GPT-5 speed / latency 46 tok/s / 6577ms input / output No data |
|---|
YUNWU API10 tests | Claude Sonnet 4.5 speed / latency 41 tok/s / 3271ms input / output No data | GPT-5 speed / latency N/A / N/A input / output No data |
|---|
Claude Sonnet 4.5 claude-sonnet-4.5 speed / latency No data input / output $0/M / $0/M | GPT-5 gpt-5 speed / latency No data input / output $1.07/M / $8.56/M |
Claude Sonnet 4.5 c/claude-sonnet-4-5-20250929 speed / latency No data input / output $0.0004/M / $0.0004/M | GPT-5 gpt-5-chat-latest speed / latency No data input / output $1.25/M / $10.00/M |
Claude Sonnet 4.5 claude-sonnet-4-5 speed / latency No data input / output $0.020/M / $0.020/M | GPT-5 gpt-5 speed / latency No data input / output $0.010/M / $0.010/M |
Claude Sonnet 4.5 claude-sonnet-4-5-20250929 speed / latency No data input / output $0.041/M / $0.205/M | GPT-5 gpt-5-2025-08-07 speed / latency No data input / output $0.034/M / $0.274/M |
Claude Sonnet 4.5 claude-sonnet-4-5-20250929 speed / latency No data input / output $0.123/M / $0.616/M | GPT-5 gpt-5-chat-latest speed / latency No data input / output $0.051/M / $0.411/M |
Rankings are based on community-submitted tests and periodic health probes. Advisory only, not official data.
