GPT-5.6-sol
gpt-5.6-sol
OpenAI · chat · api
Intelligence
Context
1.1M
Max output
128K
Input $/1M
$5.00
Output $/1M
$30.00
Modalities
text
Released
23 Jun 2026
Intelligence Index via Artificial Analysis · 0–100, higher is better
AI summary
● machine-written
GPT-5.6 Sol: OpenAI's flagship reasoning model with 1M context
GPT-5.6 Sol is OpenAI's top-tier model in the GPT-5.6 family, designed for complex reasoning, coding, and agentic workflows. It offers a 1,050,000 token context window and 128,000 token maximum output. The model is priced at $5 per million input tokens and $30 per million output tokens.
What's new
- 1.05M token context window with 128K max output tokens
- Pricing matches GPT-5.5 flagship tier at $5/$30 per 1M tokens
- Supports prompt caching with 90% discount on cached input reads
- Optimized for command-line, multi-step coding, and long-horizon problem solving
- Released July 9, 2026 with February 2026 knowledge cutoff
Best for
Complex reasoning and frontier reasoning tasksCoding and multi-step coding workflowsAgentic and autonomous agent tasksCybersecurity and long-context document processing