GPT-5.6 vs GPT-5.6 Sol
Pricing, benchmarks, and use case comparison
Quick take
- •GPT-5.6 is meaningfully stronger at cost efficiency (70 vs 55 on our capability index).
Specs comparison
| GPT-5.6 | GPT-5.6 Sol | |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Type | Closed source | Closed source |
| Context window | Not announced | Not announced |
| Input / 1M tokens | 5 | $5.00 |
| Output / 1M tokens | 30 | $30.00 |
| Release date | 2026-06 | 2026-06 |
Benchmarks
| Benchmark | GPT-5.6 | GPT-5.6 Sol |
|---|---|---|
| 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 | 88.8% |
| ExploitBench | Competitive with Anthropic Mythos Preview | competitive with Mythos Preview |
| ExploitGym | Significant improvements | - |
| GeneBench v1 | Not announced | - |
| Terminal-Bench 2.1 (Ultra) | - | 91.9% |
Scores sourced from official provider release posts and independent benchmark aggregators.
Which should you choose?
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
Choose GPT-5.6 Sol if...
- →You are an approved preview partner needing the most capable model for agentic software engineering
- →Complex multi-step tasks that benefit from subagent orchestration (Ultra) or maximum reasoning depth (max)
- →Frontier scientific research, professional knowledge work, or security-sensitive workloads