Data points: 81
The readout for Gemini 2.5 Pro and GPT-5.3 Codex, before the detailed comparison sheet.
Decision read
GPT-5.3 Codex
GPT-5.3 Codex currently has the stronger profile, with verified wins split 1 to 4.
Evidence depth
81 data points
Includes 8 benchmark rows, 0 audit samples, and 10 provider examples.
Selection signal
Start with GPT-5.3 Codex
The charts below split 18 high-signal samples across speed, scores, and audit health.
Model compare Gemini 2.5 Pro vs GPT-5.3 Codexgemini-2-5-pro-vs-gpt-5-3-codex | Model A Gemini 2.5 Pro | Model B GPT-5.3 Codex |
|---|---|---|
| Overall leader | Contender | Leading |
| Verified metric wins | 1 wins | 4 wins |
| Where it leads | Average speed | Cheapest input price, First-token latency, Provider coverage, Recent tests |
Third-party benchmark profile synced into LMSpeed; only metrics available for both models are shown.
| Metric | Gemini 2.5 Pro | GPT-5.3 Codex |
|---|---|---|
| GPQA | 84.4%#36 |
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | Gemini 2.5 Pro | GPT-5.3 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-5.3 Codex |
|---|---|---|
30 tests | Gemini 2.5 Pro speed / latency 48 tok/s / 23637ms input / output No data |
This report only uses LMSpeed data for Gemini 2.5 Pro and GPT-5.3 Codex: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Guidance | Gemini 2.5 Pro | GPT-5.3 Codex |
|---|---|---|
| When to choose each model | Gemini 2.5 Pro Gemini 2.5 Pro is stronger when you prioritize Average speed. | GPT-5.3 Codex GPT-5.3 Codex is stronger when you prioritize Cheapest input price, First-token latency, Provider coverage, Recent tests. |
TL;DR: GPT-5.3 Codex leads across 81 verifiable data points, including pricing, speed, latency, benchmarks, and provider examples.
Continue from Gemini 2.5 Pro vs GPT-5.3 Codex into nearby model comparisons with enough verified LMSpeed data.
| Model metadata | Gemini 2.5 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 | Jun 2025 | Feb 2026 |
| Modalities | Input TextImageFileAudiovideo 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 | 2025-01-31 | No data |
| OpenRouter ID | google/gemini-2.5-pro | openai/gpt-5.3-codex |
| References | No data | No data |
| HLE | 21.1%#37 | 39.9%#5 |
|---|
| SciCode | 42.8%#32 | 53.2%#8 |
|---|
| Input price | $1.25/M#30 | $1.75/M#35 |
|---|
| Output speed | 132.3 tok/s#36 | 77.7 tok/s#66 |
|---|
| Output price | $10.00/M#41 | $14.00/M#43 |
|---|
| Blended price | $3.44/M#58 | $4.81/M#62 |
|---|
| Time to first answer token | 23.08 s#77 | 57.06 s#95 |
|---|
GPT-5.3 Codex
speed / latency
N/A / N/A
input / output
No data
UoCode25 tests | Gemini 2.5 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 API10 tests | Gemini 2.5 Pro speed / latency N/A / N/A input / output No data | GPT-5.3 Codex speed / latency 201 tok/s / 2135ms input / output No data |
|---|
91VIP5 tests | Gemini 2.5 Pro speed / latency N/A / N/A input / output No data | GPT-5.3 Codex speed / latency 35 tok/s / 17640ms input / output No data |
|---|
Compute Token5 tests | Gemini 2.5 Pro speed / latency N/A / N/A input / output No data | GPT-5.3 Codex speed / latency 22 tok/s / 3141ms 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-5.3 Codex gpt-5.3-codex-openai-compact speed / latency No data input / output $0.240/M / $1.92/M |
Gemini 2.5 Pro gemini-2.5-pro 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 |
Gemini 2.5 Pro gemini-2.5-pro-c speed / latency No data input / output $0.018/M / $0.018/M | GPT-5.3 Codex gpt-5.3-codex speed / latency No data input / output $0.300/M / $2.40/M |
Gemini 2.5 Pro gemini-2.5-pro-search speed / latency No data input / output $0.021/M / $0.164/M | GPT-5.3 Codex openai/gpt-5.3-codex speed / latency No data input / output $15.41/M / $15.41/M |
Gemini 2.5 Pro gemini-2.5-pro speed / latency No data input / output $0.034/M / $0.274/M | GPT-5.3 Codex gpt-5.3-codex-xhigh speed / latency No data input / output $0.024/M / $0.192/M |
Rankings are based on community-submitted tests and periodic health probes. Advisory only, not official data.
