OpenAI/gpt-5.6-terra
1.1M contextFrom $0.1875 / 1M tokens
OpenAI's next-generation general-purpose model balancing intelligence and cost, featuring long-context reasoning, multimodal understanding, and full agent tooling for enterprise AI, coding, automation, and professional knowledge work.
Chat
More from OpenAI
README
OpenAI/gpt-5.6-terra
GPT-5.6 Terra is the balanced model in OpenAI's GPT-5.6 family, positioned between the flagship GPT-5.6 Sol and the cost-optimized GPT-5.6 Luna. It delivers strong reasoning, coding, multimodal understanding, and agent capabilities while significantly reducing inference cost, making it an ideal production model for enterprise AI applications. citeturn0search1turn0search0
Specifications
| Item | Specification |
|---|---|
| Model | GPT-5.6 Terra |
| Model ID | gpt-5.6-terra |
| Developer | OpenAI |
| Release | July 2026 |
| Input | Text, Image |
| Output | Text |
| Context Window | 1,050,000 Tokens |
| Max Output | 128,000 Tokens |
| Knowledge Cutoff | February 16, 2026 |
| Vision | ✓ Supported |
| Function Calling | ✓ Supported |
| Structured Outputs | ✓ Supported |
| Streaming | ✓ Supported |
| Reasoning Levels | none / low / medium / high / xhigh / max |
| Fine-tuning | Not Supported |
Key Capabilities
- Long-context reasoning (1.05M tokens)
- Multimodal text + image understanding
- Advanced code generation and software engineering
- Full Responses API tool ecosystem
- Agentic workflows with planning and tool use
- Enterprise document analysis
- Knowledge-intensive professional work
- Production-ready cost-performance balance citeturn0search0turn0search3
Technical Highlights
- 1.05M-token context window
- 128K-token maximum output
- Text and image input
- Function calling
- Structured outputs
- Streaming
- Full Responses API tool support
- Six configurable reasoning levels
- Approximately 50% lower input cost than GPT-5.6 Sol while maintaining strong capability. citeturn0search0turn0search1
Recommended Use Cases
- AI Agents
- Enterprise assistants
- Software engineering
- Long-document processing
- Knowledge management
- Research and analysis
- Business intelligence
- Legal and financial analysis
- Workflow automation
- Vision-enabled AI applications
Pricing
Tiered by input prompt tokens (incl. cache): once over the threshold, the whole request is billed at the higher tier.
| Token Type | Short context ≤272K | Long context >272K |
|---|---|---|
| input | $1.875$2.50-25% | $3.75$5.00-25% |
| output | $11.25$15.00-25% | $16.875$22.50-25% |
| cache_read | $0.1875$0.25-25% | $0.375$0.50-25% |
| cache_write | $2.34375$3.125-25% | $4.6875$6.25-25% |