Gemini 3 Pro vs GPT-5.5 for coding
Gemini 3 Pro is the stronger coder of the two on benchmarks, but GPT-5.5 can be the better pick when cost, speed, or context window matter more. Below: a side-by-side spec table and exactly when to pick each.
At a glance
| Spec | Gemini 3 Pro | GPT-5.5 |
|---|---|---|
| Provider | OpenAI | |
| Released | Nov 2025 | Apr 2026 |
| SWE-bench Verified | 76% | 75% |
| HumanEval | 95% | 95% |
| MMLU | 92% | 89% |
| Context window | 1M+ | 1M+ |
| Max output | 64K | 128K |
| Input price (per 1M) | $2 | $5 |
| Output price (per 1M) | $12 | $30 |
| Price tier | Premium | Premium |
| Speed | Medium | Standard |
| Hosting | Closed/API | Closed/API |
| Modality | Multimodal (vision, audio, video) | Multimodal (vision) |
| Knowledge cutoff | Jan 2026 | Jan 2026 |
Pick Gemini 3 Pro if…
- It scores higher on SWE-bench Verified (76% vs 75%), the best proxy for real-world coding.
- It's tuned for long-horizon agentic tasks, generative UI, multi-modal reasoning, Antigravity-driven workflows.
Pick GPT-5.5 if…
- It's tuned for frontier reasoning, agentic coding, long-context refactors, multimodal analysis, replaces GPT-5.4 as default flagship.
Gemini 3 Pro vs GPT-5.5: which is better for coding?
Gemini 3 Pro is the stronger coder of the two on benchmarks, but GPT-5.5 can be the better pick when cost, speed, or context window matter more. See the full spec table for SWE-bench, HumanEval, MMLU, context window, and pricing on both. Benchmarks are a directional signal, not a guarantee for your codebase — the most reliable test is running both on a real task you care about.
Compare these head-to-head with live data, or build a full stack around your pick — Flowpicker shows compatibility and monthly cost.
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See the full model leaderboard ranked by SWE-bench, HumanEval, and MMLU.