GPT-5.6 Terra
The balanced everyday tier of GPT-5.6, which OpenAI describes as competitive with GPT-5.5 at a lower price. Terra is the cheaper path for scoped implementation work and first-pass review, where Sol's full reasoning budget is more than the task needs. Standard short-context pricing is $2/$12 per MTok with cached input at $0.20, roughly 60% below Sol for the same context window.
GPT-5.6 Terra is a frontier AI model from OpenAI. It costs $2.000 per million input tokens and $12.000 per million output tokens (blended $5.000/M), with a 1,050,000-token context window.
- GPT-5.5-class performance at lower cost
- Scoped implementation work
- First-pass code review
- Tool calling
- 1M-token context
- Everyday development tasks
- First-pass review before escalating to Sol
- Mixed-workload production traffic
- Cost-aware agent steps
Benchmarks
Also reported by the provider
Results on benchmarks outside the set we compare across models. They are listed for completeness and are deliberately excluded from the bars above and from every ranking on this site, because a score is only comparable against the same benchmark variant. Why benchmark scores do not compare →
- SWE-bench Pro63.4%self-reported by OpenAI · 2026-07 · SWE-bench Verified was not published for GPT-5.6.
- Terminal-Bench 2.187.4%self-reported by OpenAI · 2026-07
- FrontierMath Tier 1–3 (v2)84.9%self-reported by OpenAI · 2026-07
- FrontierMath Tier 4 (v2)68.3%self-reported by OpenAI · 2026-07
- MMMU Pro (no tools)80.7%self-reported by OpenAI · 2026-07
- BrowseComp87.5%self-reported by OpenAI · 2026-07
- OSWorld 2.050.2%self-reported by OpenAI · 2026-07
- Agents' Last Exam50.4%self-reported by OpenAI · 2026-07
- ARC-AGI-30.8%self-reported by OpenAI · 2026-07
More from OpenAI
See all 28 →Frequently asked questions
How much does GPT-5.6 Terra cost?
GPT-5.6 Terra costs $2.000 per million input tokens and $12.000 per million output tokens, for a blended reference rate of $5.000 per million tokens.
What is GPT-5.6 Terra's context window?
GPT-5.6 Terra supports up to 1,050,000 tokens of context in a single request.
What is GPT-5.6 Terra best for?
GPT-5.6 Terra is well suited to GPT-5.5-class performance at lower cost, Scoped implementation work and First-pass code review.
Who makes GPT-5.6 Terra?
GPT-5.6 Terra is developed and served by OpenAI. It was released in Jul 2026.