Data points: 85
The readout for Gemini 3.1 Pro and GPT-5.3 Codex, before the detailed comparison sheet.
Decision read
Tie
Tie currently has the stronger profile, with verified wins split 3 to 3.
Evidence depth
85 data points
Includes 8 benchmark rows, 1 audit samples, and 8 provider examples.
Selection signal
Tie
The charts below split 17 high-signal samples across speed, scores, and audit health.
Model compare Gemini 3.1 Pro vs GPT-5.3 Codexgemini-3-1-pro-vs-gpt-5-3-codex | Model A Gemini 3.1 Pro | Model B GPT-5.3 Codex |
|---|---|---|
| Overall leader | Tie | Tie |
| Verified metric wins | 3 wins | 3 wins |
| Where it leads | Cheapest input price, Average speed, Free providers | First-token latency, Provider coverage, Recent tests |
Third-party benchmark profile synced into LMSpeed; only metrics available for both models are shown.
| Metric | Gemini 3.1 Pro | GPT-5.3 Codex |
|---|---|---|
| GPQA | 94.1%#1 |
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | Gemini 3.1 Pro | GPT-5.3 Codex |
|---|---|---|
Winner: Gemini 3.1 Pro | Gemini 3.1 Pro gemini-3.1-pro-preview Audit score 79 69 |
Speed aggregates and input/output pricing share each provider row for real API selection and migration cost checks.
| Provider | Gemini 3.1 Pro | GPT-5.3 Codex |
|---|---|---|
35 tests | Gemini 3.1 Pro speed / latency N/A / N/A input / output No data |
This report only uses LMSpeed data for Gemini 3.1 Pro and GPT-5.3 Codex: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Guidance | Gemini 3.1 Pro | GPT-5.3 Codex |
|---|---|---|
| When to choose each model | Gemini 3.1 Pro Gemini 3.1 Pro is stronger when you prioritize Cheapest input price, Average speed, Free providers. | GPT-5.3 Codex GPT-5.3 Codex is stronger when you prioritize First-token latency, Provider coverage, Recent tests. |
TL;DR: Tie leads across 85 verifiable data points, including pricing, speed, latency, benchmarks, and provider examples.
Continue from Gemini 3.1 Pro vs GPT-5.3 Codex into nearby model comparisons with enough verified LMSpeed data.
| Model metadata | Gemini 3.1 Pro exposes 1.0M tokens; notable signals: Text input, Image input, File input, Audio input. | GPT-5.3 Codex exposes 400K tokens; notable signals: Text input, Image input, File input, Text output. |
|---|---|---|
| Developer | OpenAI | |
| Context window | 1.0M tokens | 400K tokens |
| Max output | 65.5K tokens | 128K tokens |
| Released | Feb 2026 | Feb 2026 |
| Modalities | Input AudioFileImageTextvideo Output Text | Input TextImageFile Output Text |
| Features | Text inputImage inputFile inputAudio inputText outputTool callingStructured outputsJSON modeReasoning | Text inputImage inputFile inputText outputTool callingStructured outputs |
| Parameters | No data | No data |
| Tokenizer | Gemini | GPT |
| Knowledge cutoff | No data | No data |
| OpenRouter ID | google/gemini-3.1-pro-preview | openai/gpt-5.3-codex |
| References | No data | No data |
| SciCode | 58.9%#2 | 53.2%#8 |
|---|
| HLE | 44.7%#3 | 39.9%#5 |
|---|
| Input price | $2.00/M#36 | $1.75/M#35 |
|---|
| Output speed | 133.4 tok/s#35 | 77.7 tok/s#66 |
|---|
| Output price | $12.00/M#42 | $14.00/M#43 |
|---|
| Blended price | $4.50/M#61 | $4.81/M#62 |
|---|
| Time to first answer token | 28.68 s#84 | 57.06 s#95 |
|---|
GPT-5.3 Codex gpt-5.3-codex-spark No audit yet |
GPT-5.3 Codex
speed / latency
38 tok/s / 4553ms
input / output
No data
UoCode25 tests | Gemini 3.1 Pro speed / latency N/A / N/A input / output No data | GPT-5.3 Codex speed / latency 56 tok/s / 4621ms input / output No data |
|---|
小水管 API15 tests | Gemini 3.1 Pro speed / latency 113 tok/s / 15704ms input / output No data | GPT-5.3 Codex speed / latency 201 tok/s / 2135ms input / output No data |
|---|
CatClaw API10 tests | Gemini 3.1 Pro speed / latency 121 tok/s / 11404ms input / output No data | GPT-5.3 Codex speed / latency N/A / N/A input / output No data |
|---|
QQ Code10 tests | Gemini 3.1 Pro speed / latency N/A / N/A input / output No data | GPT-5.3 Codex speed / latency 57 tok/s / 2985ms input / output No data |
|---|
Gemini 3.1 Pro gemini-3.1-pro-preview speed / latency No data input / output $0.0041/M / $0.0041/M | GPT-5.3 Codex gpt-5.3-codex-openai-compact speed / latency No data input / output $0.240/M / $1.92/M |
Gemini 3.1 Pro gemini-3.1-pro speed / latency No data input / output $0.014/M / $0.137/M | GPT-5.3 Codex gpt-5.3-codex speed / latency No data input / output $0.274/M / $2.19/M |
Gemini 3.1 Pro gemini-3.1-pro-preview speed / latency No data input / output $0.014/M / $0.014/M | GPT-5.3 Codex gpt-5.3-codex-spark speed / latency No data input / output $10.27/M / $10.27/M |
Rankings are based on community-submitted tests and periodic health probes. Advisory only, not official data.
