GPT-5.6 Terra
Balanced GPT-5.6 model for everyday coding and reasoning.
GPT-5.6 Terra is a balanced model in OpenAI’s GPT-5.6 series, positioned between the flagship Sol tier and the cost-efficient Luna tier. It is suited for everyday coding, reasoning and agentic tasks.
- Provider
- OpenAI
- Type
- Language model
- Released
- Jul 9, 2026
- Context window
- 1.1M tokens
- Max output
- 128K tokens
- Price
- $2.00 input / $12.00 output per 1M tokens
- Input
- text, image, file
- Output
- text
- Open weights
- No
Best for
- Coding
- Chat & assistants
- Reasoning
- Agents
Strengths
- Fast output for its tier
- Mature ecosystem support
More from OpenAI
- GPT-6 Astra — OpenAI. OpenAI’s flagship for deep research, science and end-to-end engineering.
- GPT-6.1 Sol — OpenAI. Mid-tier GPT-6 model with excellent cost per task for agentic coding.
- GPT-6 Luna — OpenAI. Fast, cost-efficient GPT-6 tier for chat, classification and light agents.
- gpt-oss-120b — OpenAI. OpenAI’s Apache-2.0 open-weight reasoning model; runs on a single 80GB GPU.
- gpt-oss-20b — OpenAI. Compact open-weight reasoning model that runs on consumer hardware.
- GPT-5.4 Image 2 — OpenAI. OpenAI’s native image generation and editing model.
- text-embedding-3-large — OpenAI. OpenAI’s most capable embedding; the default in countless RAG stacks.
- text-embedding-3-small — OpenAI. Cheap, fast OpenAI embedding for high-volume indexing.