Plain-English Summary
The fast, lower-cost GPT-5.6 option for high-volume applications and responsive user experiences.
GPT-5.6 Luna
The fast, lower-cost GPT-5.6 option for high-volume applications and responsive user experiences.
GPT-5.6
General LLM
GA
Open weights: No
API: Yes
Technical Notes
Proprietary multimodal model with 1.05M context, 128K output, tool calling, structured output, and lighter-weight reasoning.
Best For
Chat, classification, extraction, customer support, high-volume APIs
Watch Out For
Lower ceiling on complex reasoning and advanced coding than Terra or Sol.
Model Specs
- Maker
- OpenAI
- Country
- USA
- Family
- GPT-5.6
- Type
- General 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
- Tool calling
- Yes
- Structured output
- Yes
- API available
- Yes
- Open weights
- No
- Self-hostable
- No
- License
- Proprietary
- Inputs
- Text, image
- Outputs
- Text
- Approx. price
- $1 input / $6 output per 1M tokens
- How to access
- Provider website or API
- Model / API ID
- gpt-5.6-luna
- Knowledge cutoff
- 2026-02-16
- Fine-tuning
- Prompting / RAG
- Completeness
- 90 %
- Verified
- Jul 18, 2026
- Snapshot date
- Jul 18, 2026
- Source
- Official source