GPT-5.5vsGemini 3.1 Pro Preview
Across 7 shared benchmarks, Gemini 3.1 Pro Preview leads overall: GPT-5.5 wins 3, Gemini 3.1 Pro Preview wins 4, with 0 ties and an average score difference of +50.09.
GPT-5.5
OpenAI · 2026-04-23 · Reasoning model
Gemini 3.1 Pro Preview
Google Deep Mind · 2026-02-20 · Multimodal model
GPT-5.53 wins(43%)(57%)4 winsGemini 3.1 Pro Preview
Benchmark scores
Grouped by capability, sorted by largest gap within each. 7 shared benchmarks.
Coding and Software Engineer
Even 2/2| Benchmark | GPT-5.5 | Gemini 3.1 Pro Preview | Diff |
|---|---|---|---|
| WeirdML v2 | 67.1522 / 52Normal (With Tools) | 72.1017 / 52Normal (With Tools) | -4.95 |
| SWE-Bench Pro - Public | 58.6018 / 62Thinking High (With Tools) | 54.2037 / 62Thinking High (With Tools) | +4.40 |
AI Agent - Information Search
Gemini 3.1 Pro Preview 1/1| Benchmark | GPT-5.5 | Gemini 3.1 Pro Preview | Diff |
|---|---|---|---|
| BrowseComp | 84.4010 / 57Thinking High (With Tools + Internet) | 85.907 / 57Thinking High (With Tools + Internet) | -1.50 |
AI Agent - Tool Usage
GPT-5.5 1/1| Benchmark | GPT-5.5 | Gemini 3.1 Pro Preview | Diff |
|---|---|---|---|
| Terminal Bench 2.0 | 82.701 / 48Thinking High (With Tools) | 68.508 / 48Thinking High (With Tools) | +14.20 |
Claw-style Agent Evaluation
Gemini 3.1 Pro Preview 1/1| Benchmark | GPT-5.5 | Gemini 3.1 Pro Preview | Diff |
|---|---|---|---|
| PinchBench v2 | 75.5018 / 45Reported best (effort unspecified) | 81.019 / 45Reported best (effort unspecified) | -5.51 |
Commonsense Reasoning
Gemini 3.1 Pro Preview 1/1| Benchmark | GPT-5.5 | Gemini 3.1 Pro Preview | Diff |
|---|---|---|---|
| SimpleBench | 6918 / 93Normal (No Tools) | 79.608 / 93Normal (No Tools) | -10.60 |
Writing and Creative Capabilities
GPT-5.5 1/1| Benchmark | GPT-5.5 | Gemini 3.1 Pro Preview | Diff |
|---|---|---|---|
| Creative Writing | 1,84412 / 106Normal (No Tools) | 1,48952 / 106Normal (No Tools) | +354.60 |
Specs
| Field | GPT-5.5 | Gemini 3.1 Pro Preview |
|---|---|---|
| Publisher | OpenAI | Google Deep Mind |
| Release date | 2026-04-23 | 2026-02-20 |
| Model type | Reasoning model | Multimodal model |
| Architecture | Dense | Dense |
| Parameters | Not available | Not available |
| Context length | 1000K | 1M |
| Max output | 128K | 64K |
API pricing
Prices use DataLearner records when available; missing fields are not inferred.
| Item | GPT-5.5 | Gemini 3.1 Pro Preview |
|---|---|---|
| Text input | $5 / 1M tokens | $2 / 1M tokens |
| Text output | $30 / 1M tokens | $12 / 1M tokens |
| Cache read | $0.5 / 1M tokens | $0.2 / 1M tokens |
| Cache write | $6.25 / 1M tokens | Not public |
Summary
- GPT-5.5leads in:AI Agent - Tool Usage (1/1), Writing and Creative Capabilities (1/1)
- Gemini 3.1 Pro Previewleads in:AI Agent - Information Search (1/1), Claw-style Agent Evaluation (1/1), Commonsense Reasoning (1/1)
- Tied in:Coding and Software Engineer
On average across the 7 shared benchmarks, GPT-5.5 scores 50.09 higher.
Largest single-benchmark gap: Creative Writing — GPT-5.5 1,844 vs Gemini 3.1 Pro Preview 1,489 (+354.60).
Page generated from structured model, pricing and benchmark records. No real-time LLM is used to write the prose.