Data points: 91
The readout for Claude Sonnet 4.5 and GPT-5.4, before the detailed comparison sheet.
Decision read
GPT-5.4
GPT-5.4 currently has the stronger profile, with verified wins split 1 to 5.
Evidence depth
91 data points
Includes 8 benchmark rows, 2 audit samples, and 10 provider examples.
Selection signal
Start with GPT-5.4
The charts below split 20 high-signal samples across speed, scores, and audit health.
Model compare Claude Sonnet 4.5 vs GPT-5.4claude-sonnet-4-5-vs-gpt-5-4 | Model A Claude Sonnet 4.5 | Model B GPT-5.4 |
|---|---|---|
| Overall leader | Contender | Leading |
| Verified metric wins | 1 wins | 5 wins |
| Where it leads | Cheapest input price | Average speed, First-token latency, Free providers, Provider coverage, Recent tests |
| Model metadata | Claude Sonnet 4.5 exposes 1M tokens; notable signals: Text input, Image input, File input, Text output. | GPT-5.4 exposes 1.1M tokens; notable signals: Text input, Image input, File input, Text output. |
| Developer | Anthropic | OpenAI |
| Context window | 1M tokens | 1.1M tokens |
| Max output | 64K tokens | 128K tokens |
| Released | Sep 2025 | Mar 2026 |
| 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 modeReasoning |
| Parameters | No data | No data |
| Tokenizer | Claude | GPT |
| Knowledge cutoff | 2025-01-31 | No data |
| OpenRouter ID | anthropic/claude-sonnet-4.5 | openai/gpt-5.4 |
| References | No data | No data |
Third-party benchmark profile synced into LMSpeed; only metrics available for both models are shown.
| Metric | Claude Sonnet 4.5 | GPT-5.4 |
|---|---|---|
| GPQA | 72.7%#75 | 92.0%#3 |
| SciCode | 42.8%#32 | 56.6%#3 |
| HLE | 7.1%#77 | 41.6%#4 |
| Input price | $3.00/M#39 | $2.50/M#37 |
| Time to first answer token | 1.55 s#37 | 134.24 s#111 |
| Output price | $15.00/M#44 | $15.00/M#44 |
| Output speed | 47.9 tok/s#92 | 92.4 tok/s#56 |
| Time to first token | 1.55 s#60 | 134.24 s#110 |
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | Claude Sonnet 4.5 | GPT-5.4 |
|---|---|---|
Leonhard APIWinner: Claude Sonnet 4.5 | Claude Sonnet 4.5 claude-sonnet-4.5 Audit score 91 64100100100 | GPT-5.4 gpt-5.4 No audit yet |
CodeXEWinner: Claude Sonnet 4.5 | Claude Sonnet 4.5 claude-sonnet-4.5 Audit score 86 728410088 | GPT-5.4 gpt-5.4 No audit 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-5.4 |
|---|---|---|
天宫造物60 tests | Claude Sonnet 4.5 speed / latency 45 tok/s / 3170ms input / output No data | GPT-5.4 speed / latency 50 tok/s / 7305ms input / output No data |
巨量API51 tests | Claude Sonnet 4.5 speed / latency 17 tok/s / 9739ms input / output No data | GPT-5.4 speed / latency 43 tok/s / 12778ms input / output No data |
星见雅 API25 tests | Claude Sonnet 4.5 speed / latency 7 tok/s / 4091ms input / output No data | GPT-5.4 speed / latency 49 tok/s / 5435ms input / output No data |
Sub2API20 tests | Claude Sonnet 4.5 speed / latency N/A / N/A input / output No data | GPT-5.4 speed / latency 34 tok/s / 1748ms input / output No data |
6345ywz API15 tests | Claude Sonnet 4.5 speed / latency N/A / N/A input / output No data | GPT-5.4 speed / latency 41 tok/s / 6581ms input / output No data |
Claude Sonnet 4.5 claude-sonnet-4-5-20250929 speed / latency No data input / output $43.80/M / $219.00/M | GPT-5.4 gpt-5.4-openai-compact 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 | GPT-5.4 GPT-5.4 speed / latency No data input / output $75.00/M / $75.00/M | |
Claude Sonnet 4.5 c/claude-sonnet-4-5-20250929 speed / latency No data input / output $0.0004/M / $0.0004/M | GPT-5.4 gpt-5.4 speed / latency No data input / output $1.25/M / $7.50/M | |
Claude Sonnet 4.5 claude-sonnet-4-5-20250929 speed / latency No data input / output $0.0008/M / $0.0041/M | GPT-5.4 gpt-5.4-openai-compact speed / latency No data input / output $0.0007/M / $0.0041/M | |
Claude Sonnet 4.5 claude-sonnet-4.5 speed / latency No data input / output $3.00/M / $15.00/M | GPT-5.4 gpt-5.4 speed / latency No data input / output $0.010/M / $0.010/M |
This report only uses LMSpeed data for Claude Sonnet 4.5 and GPT-5.4: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Guidance | Claude Sonnet 4.5 | GPT-5.4 |
|---|---|---|
| When to choose each model | Claude Sonnet 4.5 Claude Sonnet 4.5 is stronger when you prioritize Cheapest input price. | GPT-5.4 GPT-5.4 is stronger when you prioritize Average speed, First-token latency, Free providers, Provider coverage, Recent tests. |
TL;DR: GPT-5.4 leads across 91 verifiable data points, including pricing, speed, latency, benchmarks, and provider examples.
Continue from Claude Sonnet 4.5 vs GPT-5.4 into nearby model comparisons with enough verified LMSpeed data.
Rankings are based on community-submitted tests and periodic health probes. Advisory only, not official data.
