Gemini 2.5 Pro vs GPT-5.6
Pricing, benchmarks, and use case comparison
Quick take
- •Gemini 2.5 Pro is 75% cheaper on input tokens, which compounds fast on high-volume or agentic workloads.
Specs comparison
| Gemini 2.5 Pro | GPT-5.6 | |
|---|---|---|
| Provider | Google DeepMind | OpenAI |
| Type | Closed source | Closed source |
| Context window | ✓1,048,576 tokens (1M) input; up to 65K output | Not announced |
| Input / 1M tokens | ✓$1.25 | 5 |
| Output / 1M tokens | $10.00 | 30 |
| Release date | 2025-06 | 2026-06 |
Benchmarks
| Benchmark | Gemini 2.5 Pro | GPT-5.6 |
|---|---|---|
| Context window | 1M tokens | - |
| Pricing tier break | 200K tokens | - |
| Terminal-Bench 2.1 (Sol) | - | 88.8% |
| Terminal-Bench 2.1 (Terra) | - | 82.5% |
| Terminal-Bench 2.1 (Luna) | - | 84.3% |
| Terminal-Bench 2.1 | - | 88.8 |
| ExploitBench | - | Competitive with Anthropic Mythos Preview |
| ExploitGym | - | Significant improvements |
| GeneBench v1 | - | Not announced |
Scores sourced from official provider release posts and independent benchmark aggregators.
Which should you choose?
Choose Gemini 2.5 Pro if...
- →Complex reasoning, analysis, or STEM tasks that benefit from a thinking model
- →Processing very long inputs (long documents, large repos)
- →Multimodal tasks needing high quality
Choose GPT-5.6 if...
- →You want to standardize on one model generation but route requests across cost/quality tiers
- →You are an approved preview partner exploring the newest OpenAI capabilities
- →Workloads spanning agentic coding, knowledge work, and research where tier flexibility helps