Data points: 72
Model compare
The readout for Gemini 1.5 Pro and GPT-5.3 Codex, before the detailed comparison sheet.
Weighted outcome: GPT-5.3 Codex. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Decision read
GPT-5.3 Codex
GPT-5.3 Codex has the higher weighted result; Model A / B score 30.7 to 69.3.
Evidence depth
72 data points
Includes 8 benchmark rows, 0 audit samples, and 7 provider examples.
Selection signal
Start with GPT-5.3 Codex
The charts below split 15 high-signal samples across speed, scores, and audit health.
Switch either side of this report to compare another model with the same LMSpeed data pipeline.
Select a different model to open a new comparison URL.
This report only uses LMSpeed data for Gemini 1.5 Pro and GPT-5.3 Codex: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Model compare | Gemini 1.5 Pro | GPT-5.3 Codex |
|---|---|---|
| Overall leader | Contender | Leading |
| Weighted overall score | 30.7 pts | 69.3 pts |
| Benchmark category leads | 1 categories | 2 categories |
| Operational advantages | First-token latency | Cheapest input price, Average speed, Free providers, Provider coverage |
| Context window | No data | 400K tokens |
| Max output | No data | 128K tokens |
| Modalities | No data | Input TextImageFile Output Text |
The overall result weights benchmark capability categories at 80% and price, API speed/latency, and availability at 20%. Recent test volume does not affect the winner, and missing benchmark categories are excluded.
| Model compare | Gemini 1.5 Pro | GPT-5.3 Codex |
|---|---|---|
| Developer | OpenAI | |
| Released | No data | Feb 2026 |
| Parameters | No data | No data |
| Tokenizer | No data | GPT |
| Knowledge cutoff | No data | No data |
| OpenRouter ID | No data | openai/gpt-5.3-codex |
| References | No data | No data |
This report only uses LMSpeed data for Gemini 1.5 Pro and GPT-5.3 Codex: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
Gemini 1.5 Pro
Gemini 1.5 Pro is stronger in benchmark categories (Knowledge) and operational dimensions (First-token latency).
GPT-5.3 Codex
GPT-5.3 Codex is stronger in benchmark categories (Coding, Reasoning) and operational dimensions (Cheapest input price, Average speed, Free providers, Provider coverage).
Third-party benchmark profile synced into LMSpeed; only metrics available for both models are shown.
Compare benchmark category scores on a 0-100 scale. Select a category to inspect the gap.
Avg. score
Gemini 1.5 Pro
45
Avg. score
GPT-5.3 Codex
56.7
GPT-5.3 Codex
GPT-5.3 Codex leads by 18.3
GPT-5.3 Codex leads by 20.5
Gemini 1.5 Pro leads by 0.1
Gemini 1.5 Pro
No data
No data
GPT-5.3 Codex
Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.
Gemini 1.5 Pro
58.9%
Rank #143/187 · confidence 4
GPT-5.3 Codex
winner91.5%
Rank #11/187 · confidence 4
Gemini 1.5 Pro
4.9%
Rank #137/186 · confidence 4
GPT-5.3 Codex
winner39.9%
Rank #12/186 · confidence 4
Gemini 1.5 Pro
29.5%
Rank #138/184 · confidence 4
GPT-5.3 Codex
winner53.2%
Rank #10/184 · confidence 4
Gemini 1.5 Pro
29.5
Rank #87/96 · confidence 1 · eval date 2024-02-15
GPT-5.3 Codex
winner53.2
Rank #14/96 · confidence 1 · eval date 2026-02-05
Gemini 1.5 Pro
4.9
Rank #80/96 · confidence 1 · eval date 2024-02-15
GPT-5.3 Codex
winner39.9
Rank #11/96 · confidence 1 · eval date 2026-02-05
Gemini 1.5 Pro
58.9
Rank #86/96 · confidence 1 · eval date 2024-02-15
GPT-5.3 Codex
winner91.5
Rank #12/96 · confidence 1 · eval date 2026-02-05
Gemini 1.5 Pro
10.0
Rank #93/99 · confidence 1 · eval date 2024-02-15
GPT-5.3 Codex
winner44.3
Rank #16/99 · confidence 1 · eval date 2026-02-05
Gemini 1.5 Pro
55.0
Rank #52/57 · confidence 1 · eval date 2024-02-15
GPT-5.3 Codex
winner78.5
Rank #14/57 · confidence 1 · eval date 2026-02-05
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | Gemini 1.5 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 1.5 Pro | GPT-5.3 Codex |
|---|---|---|
35 tests | Gemini 1.5 Pro speed / latency N/A / N/A input / output No data | GPT-5.3 Codex speed / latency 38 tok/s / 4553ms input / output No data |
25 tests | Gemini 1.5 Pro models/gemini-1.5-pro speed / latency N/A / N/A input / output $0.014/M/$0.137/M | GPT-5.3 Codex gpt-5.3-codex speed / latency 56 tok/s / 4621ms input / output $0.068/M |
5 tests | Gemini 1.5 Pro speed / latency 18 tok/s / 2583ms input / output No data | GPT-5.3 Codex speed / latency N/A / N/A input / output No data |
0 tests | Gemini 1.5 Pro speed / latency N/A / N/A input / output No data | GPT-5.3 Codex speed / latency N/A / N/A input / output No data |
0 tests | Gemini 1.5 Pro speed / latency N/A / N/A input / output No data | GPT-5.3 Codex speed / latency N/A / N/A input / output No data |
Gemini 1.5 Pro gemini-1.5-pro-exp-0827 speed / latency No data input / output $0/request | GPT-5.3 Codex gpt-5.3-codex-2026-02-24 speed / latency No data input / output $0/request | |
Gemini 1.5 Pro models/gemini-1.5-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 $0.068/M |
Weighted outcome: GPT-5.3 Codex. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
| Features | None listed | Text inputImage inputFile inputText outputTool callingStructured outputsJSON modeReasoning |
|---|
