Compare · ModelsLive · 2 picked · head to head
Gemini 3.1 Pro Preview vs GPT-5.3-Codex
Side by side · benchmarks, pricing, and signals you can act on.
Winner summary
Gemini 3.1 Pro Preview wins on 6/8 benchmarks
Gemini 3.1 Pro Preview wins 6 of 8 shared benchmarks. Leads in speed · agentic · knowledge.
Category leads
speed·Gemini 3.1 Pro Previewagentic·Gemini 3.1 Pro Previewknowledge·Gemini 3.1 Pro Previewcoding·Gemini 3.1 Pro Preview
Hype vs Reality
Attention vs performance
Gemini 3.1 Pro Preview
#36 by perf·no signal
GPT-5.3-Codex
#84 by perf·no signal
Best value
Gemini 3.1 Pro Preview
1.3x better value than GPT-5.3-Codex
Gemini 3.1 Pro Preview
8.7 pts/$
$7.00/M
GPT-5.3-Codex
6.6 pts/$
$7.88/M
Vendor risk
Who is behind the model
Google DeepMind
$4.00T·Tier 1
OpenAI
$840.0B·Tier 1
Head to head
8 benchmarks · 2 models
Gemini 3.1 Pro PreviewGPT-5.3-Codex
Artificial Analysis · Agentic Index
GPT-5.3-Codex leads by +3.1
Gemini 3.1 Pro Preview
59.1
GPT-5.3-Codex
62.2
Artificial Analysis · Coding Index
Gemini 3.1 Pro Preview leads by +2.4
Gemini 3.1 Pro Preview
55.5
GPT-5.3-Codex
53.1
Artificial Analysis · Quality Index
Gemini 3.1 Pro Preview leads by +3.2
Gemini 3.1 Pro Preview
57.2
GPT-5.3-Codex
54.0
APEX-Agents
Gemini 3.1 Pro Preview leads by +1.8
APEX-Agents · evaluates AI agents on complex, multi-step tasks requiring planning, tool use, and autonomous decision-making in realistic environments.
Gemini 3.1 Pro Preview
33.5
GPT-5.3-Codex
31.7
PostTrainBench
Gemini 3.1 Pro Preview leads by +3.8
Gemini 3.1 Pro Preview
21.6
GPT-5.3-Codex
17.8
SWE-Bench verified
Gemini 3.1 Pro Preview leads by +0.8
Gemini 3.1 Pro Preview
75.6
GPT-5.3-Codex
74.8
Terminal Bench
Gemini 3.1 Pro Preview leads by +1.1
Terminal Bench · tests the ability to accomplish real-world tasks using terminal commands, evaluating shell scripting and CLI tool proficiency.
Gemini 3.1 Pro Preview
78.4
GPT-5.3-Codex
77.3
WeirdML
GPT-5.3-Codex leads by +7.2
WeirdML · tests models on unusual and adversarial machine learning tasks that require creative problem-solving beyond standard patterns.
Gemini 3.1 Pro Preview
72.1
GPT-5.3-Codex
79.3
Full benchmark table
| Benchmark | Gemini 3.1 Pro Preview | GPT-5.3-Codex |
|---|---|---|
Artificial Analysis · Agentic Index | 59.1 | 62.2 |
Artificial Analysis · Coding Index | 55.5 | 53.1 |
Artificial Analysis · Quality Index | 57.2 | 54.0 |
APEX-Agents APEX-Agents · evaluates AI agents on complex, multi-step tasks requiring planning, tool use, and autonomous decision-making in realistic environments. | 33.5 | 31.7 |
PostTrainBench | 21.6 | 17.8 |
SWE-Bench verified | 75.6 | 74.8 |
Terminal Bench Terminal Bench · tests the ability to accomplish real-world tasks using terminal commands, evaluating shell scripting and CLI tool proficiency. | 78.4 | 77.3 |
WeirdML WeirdML · tests models on unusual and adversarial machine learning tasks that require creative problem-solving beyond standard patterns. | 72.1 | 79.3 |
Pricing · per 1M tokens · projected $/mo at 10M tokens
| Model | Input | Output | Context | Projected $/mo |
|---|---|---|---|---|
| Gemini 3.1 Pro Preview | $2.00 | $12.00 | 1.0M tokens (~524 books) | $45.00 |
| GPT-5.3-Codex | $1.75 | $14.00 | 400K tokens (~200 books) | $48.13 |
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