GPT-5.6 Terra
Mid-tierby OpenAI
GPT-5.6 Terra is the balanced everyday model in the GPT-5.6 family, previewed June 26, 2026. OpenAI positions it as GPT-5.5-class performance at roughly half the price: $2.50 per million input tokens and $15 per million output, with a 1 million token context window. Access at launch is limited to roughly 20 pre-approved organizations under a US Government preview arrangement, with broader availability planned in the coming weeks. Detailed SWE-bench, MMLU-Pro, and GDPval results are not yet public; OpenAI disclosed coding, biology, and cybersecurity numbers in the preview post and said the rest land at GA.
Input Price
$2.50
per 1M tokens
Output Price
$15.00
per 1M tokens
Context Window
1M
tokens
Released
2026-06
API access
Capabilities
Key Strengths
- ✓Half the input price of GPT-5.5 at GPT-5.5-class performance
- ✓1M token context window
- ✓Same lineage as Sol with cheaper economics
- ✓Reasoning, vision, tool use, and code included
Best For
- ▸Production agentic workflows where Sol is overkill
- ▸High-volume coding assistants
- ▸RAG over very long contexts
- ▸Migration target from GPT-5.5 once Terra reaches GA
Pricing Details
Input tokens
$2.50
per 1M tokens
Output tokens
$15.00
per 1M tokens
Estimated cost per 1K requests
$10.00
~1K input + ~500 output tokens avg
Prices are subject to change. Check the official documentation for current pricing. See the cost calculator for detailed estimates.
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