GPT-5.6 is OpenAI’s advanced AI reasoning model with improved coding, research, and agent capabilities to solve complex tasks and boost productivity.
Three breakthrough capabilities make GPT-5.6 a true production-ready reasoning partner.
From Light for instant responses to xHigh for complex analysis, plus Max for deep exploration and Ultra for multi-agent parallel processing. Choose the exact thinking depth your task requires.
Ingest and cross-reference massive code repositories, legal libraries, or research datasets without losing track of nuanced details.
GPT-5.6 creates polished websites and applications with stronger layout, visual hierarchy, and design judgment — scoring 4.4/5 on frontend QA benchmarks.
GPT-5.6 delivers frontier performance with significantly fewer tokens and lower costs than previous OpenAI models. The comparison below shows the concrete improvements that matter for production workflows.
| Feature | GPT-5.6 Sol | GPT-5.6 Terra | GPT-5.6 Luna | GPT-5.5 |
|---|---|---|---|---|
| Input Price (per MTok) | $5 | $2.50 | $1 | $3 |
| Output Price (per MTok) | $30 | $15 | $6 | $12 |
| Context Window | 1.05M | 1.05M | 1.05M | 400K |
| Max Output | 128K | 128K | 128K | 64K |
| Reasoning Levels | 5 + Max + Ultra | 5 + Max | 5 | 3 |
| Coding Agent Index | 80 (SOTA) | ~75 | ~70 | 72.6 |
| Multi-Agent | Yes (Ultra) | No | No | No |
| Programmatic Tools | Yes | Yes | Yes | No |
Get started with GPT-5.6 in minutes and scale it across your entire workflow.
Select GPT-5.6 Sol for complex reasoning and coding, Terra for balanced daily work, or Luna for high-volume lightweight tasks. Access via ChatGPT, Codex, or the OpenAI API.
Pick from Light, Low, Medium, High, or xHigh based on task complexity. For the hardest problems, enable Max or Ultra mode. Start low and increase only when needed to optimize cost.
Use the Responses API with programmatic tool calling, multi-agent coordination, and explicit prompt caching. Monitor token usage and adjust reasoning levels to balance quality and cost.
Ready to experience OpenAI's most advanced AI reasoning model? Start using GPT-5.6 today in NoteGPT. Whether you need deep reasoning, autonomous agents, or polished document generation, GPT-5.6 Sol, Terra, and Luna scale with your ambition.
Get Started with GPT-5.6
Fabian Hedin
Co-Founder at Lovable
GPT-5.6 is notably efficient on the long, complex workflows behind building production-grade apps. It delivers for users with roughly 25% fewer steps and 35-48% fewer tool calls than the prior model, while improving project success and reducing stuck runs by 15%.
Chaz Englander
Co-Founder & CEO at Model ML
GPT-5.6 Sol is the first model we've evaluated that consistently generates decks ready for real work. Across 20 challenging client workflows and hundreds of decks, it used 39% fewer tokens per deck than Fable while producing more polished, legible decks with clearer data visualizations.
AJ Orbach
CEO at Triple Whale
GPT-5.6 was the best overall frontend model in our seven-task benchmark. On our five-point frontend QA rubric, it scored 4.4, compared with 4.0 for GPT-5.5 and 3.5 for Claude 4.8.
Teddy Cross
Co-Founder & CPO at PlayCo
With GPT-5.6's Programmatic Tool Calling, we could build detailed Unity scenes through our structured API much more efficiently. Across scene-construction workflows, it used 63.5% fewer total tokens and 50.1% fewer model turns while producing comparable visual results.
Danny Wu
Head of AI Products at Canva
GPT-5.6 is especially strong on presentations. In our early design evals, it was stronger than competitive models for slide creation and about 1.6x more token-efficient, which matters when you're generating and refining visual work at Canva scale.
Charles Lamanna
EVP, Copilot, Agents and Platform at Microsoft
GPT-5.6 marks an advancement for artifact generation in Microsoft 365. In our evaluations, it delivered strong results across a wide range of productivity scenarios, producing outputs that were highly cohesive, accurate, and ready for use.
