Data points: 79
The readout for Gemini 2.5 Pro and GPT-5.1 Codex, before the detailed comparison sheet.
Decision read
Gemini 2.5 Pro
Gemini 2.5 Pro currently has the stronger profile, with verified wins split 3 to 0.
Evidence depth
79 data points
Includes 8 benchmark rows, 0 audit samples, and 10 provider examples.
Selection signal
Start with Gemini 2.5 Pro
The charts below split 18 high-signal samples across speed, scores, and audit health.
Model compare Gemini 2.5 Pro vs GPT-5.1 Codexgemini-2-5-pro-vs-gpt-5-1-codex | Model A Gemini 2.5 Pro | Model B GPT-5.1 Codex |
|---|---|---|
| Overall leader | Leading | Contender |
| Verified metric wins | 3 wins | 0 wins |
| Where it leads | Cheapest input price, Provider coverage, Recent tests | No data |
| Model metadata | Gemini 2.5 Pro exposes 1.0M tokens; notable signals: Text input, Image input, File input, Audio input. | GPT-5.1 Codex exposes 400K tokens; notable signals: Text input, Image input, Text output, Tool calling. |
| Developer | OpenAI | |
| Context window | 1.0M tokens | 400K tokens |
| Max output | 65.5K tokens | 128K tokens |
| Released | Jun 2025 | Nov 2025 |
| Modalities | Input TextImageFileAudiovideo Output Text | Input TextImage Output Text |
| Features | Text inputImage inputFile inputAudio inputText outputTool callingStructured outputsJSON modeReasoning | Text inputImage inputText outputTool callingStructured outputsJSON modeReasoning |
| Parameters | No data | No data |
| Tokenizer | Gemini | GPT |
| Knowledge cutoff | 2025-01-31 | No data |
| OpenRouter ID | google/gemini-2.5-pro | openai/gpt-5.1-codex |
| References | No data | No data |
Third-party benchmark profile synced into LMSpeed; only metrics available for both models are shown.
| Metric | Gemini 2.5 Pro | GPT-5.1 Codex |
|---|---|---|
| LiveCodeBench | 80.1%#18 | 84.9%#10 |
| MMLU-Pro | 86.2%#12 | 86.0%#13 |
| Output speed | 132.3 tok/s#36 | 185.7 tok/s#15 |
| GPQA | 84.4%#36 | 86.0%#26 |
| Input price | $1.25/M#30 | $1.25/M#30 |
| SciCode | 42.8%#32 | 40.2%#46 |
| HLE | 21.1%#37 | 23.4%#33 |
| Output price | $10.00/M#41 | $10.00/M#41 |
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | Gemini 2.5 Pro | GPT-5.1 Codex |
|---|---|---|
| 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 | Gemini 2.5 Pro | GPT-5.1 Codex |
|---|---|---|
CatClaw API30 tests | Gemini 2.5 Pro speed / latency 48 tok/s / 23637ms input / output No data | GPT-5.1 Codex speed / latency N/A / N/A input / output No data |
DeepRouter5 tests | Gemini 2.5 Pro speed / latency 92 tok/s / 16347ms input / output No data | GPT-5.1 Codex speed / latency N/A / N/A input / output No data |
N1N5 tests | Gemini 2.5 Pro speed / latency 106 tok/s / 16405ms input / output No data | GPT-5.1 Codex speed / latency N/A / N/A input / output No data |
Rnglg2 API5 tests | Gemini 2.5 Pro speed / latency 111 tok/s / 17899ms input / output No data | GPT-5.1 Codex speed / latency N/A / N/A input / output No data |
素墨API5 tests | Gemini 2.5 Pro speed / latency 82 tok/s / 17042ms input / output No data | GPT-5.1 Codex speed / latency N/A / N/A input / output No data |
Gemini 2.5 Pro gemini-2.5-pro speed / latency No data input / output $0.014/M / $0.904/M | GPT-5.1 Codex gpt-5.1-codex speed / latency No data input / output $0.041/M / $0.329/M | |
Gemini 2.5 Pro gemini-2.5-pro speed / latency No data input / output $0.014/M / $0.014/M | GPT-5.1 Codex gpt-5.1-codex-xhigh speed / latency No data input / output $10.27/M / $10.27/M | |
Gemini 2.5 Pro gemini-2.5-pro speed / latency No data input / output $0.034/M / $0.274/M | GPT-5.1 Codex gpt-5.1-codex-xhigh speed / latency No data input / output $0.017/M / $0.137/M | |
Gemini 2.5 Pro gemini-2.5-pro speed / latency No data input / output $1.20/M / $9.59/M | GPT-5.1 Codex gpt-5.1-codex speed / latency No data input / output $0.019/M / $0.019/M | |
Gemini 2.5 Pro gemini-2.5-pro-search speed / latency No data input / output $0.021/M / $0.164/M | GPT-5.1 Codex openai/gpt-5.1-codex speed / latency No data input / output $1.23/M / $1.23/M |
This report only uses LMSpeed data for Gemini 2.5 Pro and GPT-5.1 Codex: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Guidance | Gemini 2.5 Pro | GPT-5.1 Codex |
|---|---|---|
| When to choose each model | Gemini 2.5 Pro Gemini 2.5 Pro is stronger when you prioritize Cheapest input price, Provider coverage, Recent tests. | GPT-5.1 Codex GPT-5.1 Codex does not clearly lead on the verified metrics here, so check provider-specific pricing before choosing. |
TL;DR: Gemini 2.5 Pro leads across 79 verifiable data points, including pricing, speed, latency, benchmarks, and provider examples.
Continue from Gemini 2.5 Pro vs GPT-5.1 Codex 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.
