Data points: 81
The readout for Claude Sonnet 4.5 and GPT-5.2, before the detailed comparison sheet.
Decision read
GPT-5.2
GPT-5.2 currently has the stronger profile, with verified wins split 2 to 4.
Evidence depth
81 data points
Includes 8 benchmark rows, 0 audit samples, and 10 provider examples.
Selection signal
Start with GPT-5.2
The charts below split 18 high-signal samples across speed, scores, and audit health.
Model compare Claude Sonnet 4.5 vs GPT-5.2claude-sonnet-4-5-vs-gpt-5-2 | Model A Claude Sonnet 4.5 | Model B GPT-5.2 |
|---|---|---|
| Overall leader | Contender | Leading |
| Verified metric wins | 2 wins | 4 wins |
| Where it leads | Cheapest input price, Free providers | Average speed, First-token latency, Provider coverage, Recent tests |
| Model metadata | Claude Sonnet 4.5 exposes 1M tokens; notable signals: Text input, Image input, File input, Text output. | GPT-5.2 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 | Dec 2025 |
| Modalities | Input TextImageFile Output Text | Input FileImageText 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 | GPT |
| Knowledge cutoff | 2025-01-31 | No data |
| OpenRouter ID | anthropic/claude-sonnet-4.5 | openai/gpt-5.2-chat |
| 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-5.2 |
|---|---|---|
| LiveCodeBench | 59.0%#44 | 88.9%#4 |
| MMLU-Pro | 86.0%#13 | 87.4%#6 |
| GPQA | 72.7%#75 | 90.3%#9 |
| HLE | 7.1%#77 | 35.4%#9 |
| SciCode | 42.8%#32 | 52.1%#9 |
| Input price | $3.00/M#39 | $1.75/M#35 |
| Time to first answer token | 1.55 s#37 | 115.69 s#109 |
| Output price | $15.00/M#44 | $14.00/M#43 |
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | Claude Sonnet 4.5 | GPT-5.2 |
|---|---|---|
| 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-5.2 |
|---|---|---|
星见雅 API20 tests | Claude Sonnet 4.5 speed / latency 7 tok/s / 4091ms input / output No data | GPT-5.2 speed / latency 52 tok/s / 2671ms input / output No data |
CatClaw API15 tests | Claude Sonnet 4.5 speed / latency 46 tok/s / 5111ms input / output No data | GPT-5.2 speed / latency N/A / N/A input / output No data |
N1N15 tests | Claude Sonnet 4.5 speed / latency N/A / N/A input / output No data | GPT-5.2 speed / latency 56 tok/s / 1798ms input / output No data |
A310 tests | Claude Sonnet 4.5 speed / latency 46 tok/s / 1349ms input / output No data | GPT-5.2 speed / latency 45 tok/s / 1716ms input / output No data |
PackyAPI10 tests | Claude Sonnet 4.5 speed / latency N/A / N/A input / output No data | GPT-5.2 speed / latency 94 tok/s / 11492ms input / output No data |
Claude Sonnet 4.5 claude-sonnet-4.5 speed / latency No data input / output $0/M / $0/M | GPT-5.2 GPT-5.2 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-5.2 gpt-5.2-chat-latest speed / latency No data input / output $1.75/M / $14.00/M | |
Claude Sonnet 4.5 claude-sonnet-4-5-20250929 speed / latency No data input / output $0.0008/M / $0.0041/M | GPT-5.2 gpt-5.2-openai-compact speed / latency No data input / output $0.0005/M / $0.0038/M | |
Claude Sonnet 4.5 claude-sonnet-4-5 speed / latency No data input / output $0.020/M / $0.020/M | GPT-5.2 gpt-5.2 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-5.2 gpt-5.2-medium speed / latency No data input / output $0.024/M / $0.192/M |
This report only uses LMSpeed data for Claude Sonnet 4.5 and GPT-5.2: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Guidance | Claude Sonnet 4.5 | GPT-5.2 |
|---|---|---|
| When to choose each model | Claude Sonnet 4.5 Claude Sonnet 4.5 is stronger when you prioritize Cheapest input price, Free providers. | GPT-5.2 GPT-5.2 is stronger when you prioritize Average speed, First-token latency, Provider coverage, Recent tests. |
TL;DR: GPT-5.2 leads across 81 verifiable data points, including pricing, speed, latency, benchmarks, and provider examples.
Continue from Claude Sonnet 4.5 vs GPT-5.2 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.
