GPT-5.6 Models by OpenAI
Last refreshed 2026-07-09. Next refresh: weekly.
Details
Capabilities
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OpenAI's GPT-5.6 family includes Sol, the flagship tier, Terra, a balanced lower-cost tier, and Luna, the fastest and most affordable tier. The family moved from limited trusted-partner preview to general availability on July 9, 2026 across ChatGPT, Codex, and the OpenAI API, with stronger agentic coding, knowledge-work, cybersecurity, science, multimodal, long-context, tool-use, and multi-agent capabilities.
Decision facts
- Best fit
- vision and multimodal workreasoningJSON / Tool use
- Capability starting point
- GPT-5.6 Sol with 1.05m context and reasoning, JSON / Tool use, and multimodal inputs
- Lowest tracked input
- GPT-5.6 Luna · $1/1M · OpenAI API
- Closest related family
- GPT Realtime 2
Current Variants
Use-when guidance is based on each model's tracked capabilities, context window, release date, and replacement status.
Use when the workload needs 1.05m context, reasoning, and JSON / Tool use.
Use when the workload needs 1.05m context, reasoning, and JSON / Tool use.
Use when the workload needs 1.05m context, reasoning, and JSON / Tool use.
| Model | Use when | Released | Signals | Status |
|---|---|---|---|---|
| GPT-5.6 Sol | Use when the workload needs 1.05m context, reasoning, and JSON / Tool use. | 2026-07 | 1.05m contextreasoningJSON / Tool use | Current |
| GPT-5.6 Terra | Use when the workload needs 1.05m context, reasoning, and JSON / Tool use. | 2026-07 | 1.05m contextreasoningJSON / Tool use | Current |
| GPT-5.6 Luna | Use when the workload needs 1.05m context, reasoning, and JSON / Tool use. | 2026-07 | 1.05m contextreasoningJSON / Tool use | Current |
Release Timeline
1 release groupSpecifications(3 models)
| Model | Released | Context | Vision | Multimodal | Reasoning | JSON / Tool use | Code Exec |
|---|---|---|---|---|---|---|---|
| GPT-5.6 Sol | 2026-07 | 1.05m | Yes | Yes | Yes | Yes | Yes |
| GPT-5.6 Terra | 2026-07 | 1.05m | Yes | Yes | Yes | Yes | No |
| GPT-5.6 Luna | 2026-07 | 1.05m | Yes | Yes | Yes | Yes | No |
Available From(2 providers)
Pricing
| Model | Provider | Input / 1M | Output / 1M | Type |
|---|---|---|---|---|
| GPT-5.6 Luna | OpenAI API | $1 | $6 | Serverless |
| GPT-5.6 Luna | OpenRouter | $1 | $6 | Serverless |
| GPT-5.6 Terra | OpenAI API | $2.5 | $15 | Serverless |
| GPT-5.6 Terra | OpenRouter | $2.5 | $15 | Serverless |
| GPT-5.6 Sol | OpenAI API | $5 | $30 | Serverless |
| GPT-5.6 Sol | OpenRouter | $5 | $30 | Serverless |
Comparisons
- GPT-5.6 Sol vs Claude Fable 5
- GPT-5.6 Sol vs Claude Opus 4.8
- GPT-5.6 Sol vs Claude Sonnet 5
- GPT-5.6 Sol vs DeepSeek V4 Pro
- GPT-5.6 Sol vs Gemini 3.5 Pro
- GPT-5.6 Sol vs GPT-5.5
- GPT-5.6 Sol vs GPT-5.5 Pro
- GPT-5.6 Sol vs Grok 4.5
