GPT-5.6 Sol — AI Model Review & Pricing
OpenAI's flagship GPT-5.6 tier for frontier reasoning and long-horizon agentic work. Sets a Terminal-Bench 2.1 state of the art (91.9% in Ultra mode). Introduces a max reasoning-effort control and an Ultra multi-agent mode that coordinates parallel sub-agents. 1.05M-token context window.
Specifications
| Attribute | Value |
|---|---|
| Lab | OpenAI |
| Tags | Agentic Coding Intelligent Long Context Reasoning |
| Release Date | 2026-07 |
| Context Window | 1,050,000 tokens |
| Input Price / 1M | $5.00 |
| Output Price / 1M | $30.00 |
| Input Modalities | Text |
| Output Modalities | Text |
Strengths
- Terminal-Bench 2.1 SOTA (91.9% in Ultra mode)
- Ultra multi-agent mode coordinates parallel sub-agents for complex tasks
- 1.05M-token context for long-horizon agentic work
- Max reasoning-effort control for deeper single-pass reasoning
- New predictable prompt-caching with explicit cache controls
Weaknesses
- Highest GPT-5.6 price at $5/$30 per 1M tokens
- Ultra mode multiplies token spend via parallel sub-agents
- Limited preview access at launch; GA rolling out
Best For
- Frontier agentic coding and tool use
- Long-horizon automation and research
- Deep reasoning and hard multi-step problems
In Depth: GPT-5.6 Sol
Draft layout · copy TKSummary
GPT-5.6 Sol is an AI model from OpenAI ranked #4 of 120 on the LMRank leaderboard.
Released 2026-07. It supports Text input and produces Text output, with a context window of 1,050,000 tokens. Input pricing is $5.00 per 1M tokens and output is $30.00 per 1M tokens on OpenRouter.