GPT-5.6 Terra
Everyday production workloads that need strong quality without Sol-tier pricing.
GPT-5.6 Terra supersedes GPT-4.1, GPT-4o, GPT-4 Turbo.
What are GPT-5.6 Terra's specs and price?
GPT-5.6 Terra, built by OpenAI, ships a 400K-token context window and a 128K-token max output, released 2026-06. It supports text and vision input with a dedicated reasoning mode and costs $4.50 per million blended tokens, the 27th-cheapest of 32 models we track.
Specs
| Context window | 400K tokens |
| Max output | 128K tokens |
| Modalities | text, vision |
| Extended thinking | Yes |
| Released | 2026-06 |
| Knowledge cutoff | 2026-03 |
| Provider | OpenAI |
Verified 2026-08-08 — source.
Where it ranks
Strengths
- Balanced cost-to-intelligence ratio
- Reasoning mode available on demand
- Same 400K context as Sol
More about GPT-5.6 Terra
FAQ
What is GPT-5.6 Terra's context window?
GPT-5.6 Terra has a 400K-token context window and a 128K-token max output — the 11th-largest context of the 32 current models we track. Source: https://platform.openai.com/docs/models, verified 2026-08-08.
Does GPT-5.6 Terra support vision or audio input?
Yes — GPT-5.6 Terra accepts vision input in addition to text.
Does GPT-5.6 Terra have a reasoning or extended-thinking mode?
Yes — GPT-5.6 Terra exposes a dedicated reasoning mode for multi-step problems.
When was GPT-5.6 Terra released, and what is its knowledge cutoff?
GPT-5.6 Terra was released 2026-06 with a knowledge cutoff of 2026-03.
How much does GPT-5.6 Terra cost, and who provides it?
GPT-5.6 Terra is served by OpenAI at $4.50/M blended tokens (3:1 input:output) — the 27th-cheapest of 32 current models. Full pricing breakdown: /llm-api-pricing/gpt-5-6-terra.