Plain-English Summary
A balanced GPT-5.6 model designed to deliver strong quality at a lower cost than Sol.
GPT-5.6 Terra
A balanced GPT-5.6 model designed to deliver strong quality at a lower cost than Sol.
GPT-5.6
Reasoning LLM
GA
Open weights: No
API: Yes
Technical Notes
Proprietary multimodal reasoning model with 1.05M context, 128K output, tool use, and structured output support.
Best For
Production assistants, coding, analysis, agents, business workflows
Watch Out For
Less capable than Sol on the hardest tasks; more expensive than Luna.
Model Specs
- Maker
- OpenAI
- Country
- USA
- Family
- GPT-5.6
- Type
- Reasoning LLM
- Release date
- 2026-07-09
- Date confidence
- Exact
- Status
- GA
- Context window
- 1,050,000 tokens
- Max output
- 128,000
- Parameters
- Not disclosed
- Active parameters
- Not disclosed
- Architecture
- Proprietary multimodal transformer
- Reasoning
- Yes — configurable
- Tool calling
- Yes
- Structured output
- Yes
- API available
- Yes
- Open weights
- No
- Self-hostable
- No
- License
- Proprietary
- Inputs
- Text, image
- Outputs
- Text
- Approx. price
- $2.50 input / $15 output per 1M tokens
- How to access
- Provider website or API
- Model / API ID
- gpt-5.6-terra
- Knowledge cutoff
- 2026-02-16
- Fine-tuning
- Prompting / RAG
- Completeness
- 90 %
- Verified
- Jul 18, 2026
- Snapshot date
- Jul 18, 2026
- Source
- Official source