GPT-5.6 Sol

Released July 9, 2026 — generally available across ChatGPT, Codex and the OpenAI API after a June 26 preview. Sol is the flagship tier of OpenAI's GPT-5.6 family, adding maximum-reasoning and an Ultra subagent mode, with a ~1.05M-token context and 128K max output.

GPT-5.6 Sol strengths

• Frontier reasoning with an Ultra subagent mode
• Highest-stakes agents and complex coding
• ~1.05M context / 128K max output
• Multimodal (text + image)
• Fast mode available on Cerebras hardware

Pricing & context

Cost guide: a typical call of about 10K input + 2K output tokens costs roughly $0.110 at list prices. Worth modelling against cheaper tiers before committing high-volume traffic.

When to choose GPT-5.6 Sol

GPT-5.6 Sol is best for the highest-stakes reasoning, complex agents and frontier coding where capability outweighs cost. For a cheaper OpenAI option, weigh it against GPT-5.6 Terra or GPT-5.5.

GPT-5.6 Sol FAQ

How much does GPT-5.6 Sol cost?

GPT-5.6 Sol is priced at $5.00 per 1M input tokens and $30.00 per 1M output tokens (public API list price), with a ~1.05M-token context window. A typical 10K-input / 2K-output call costs roughly $0.11.

What is GPT-5.6 Sol best for?

GPT-5.6 Sol by OpenAI is best for the highest-stakes reasoning, complex agents and frontier coding where capability outweighs cost.

How does GPT-5.6 Sol compare to GPT-5.5?

GPT-5.6 Sol is the newer flagship, adding maximum-reasoning and an Ultra subagent mode at the same $5 / $30 pricing as GPT-5.5. For most workloads Sol supersedes GPT-5.5; the mid-tier GPT-5.6 Terra offers similar quality for roughly half the price.

Is GPT-5.6 Sol multimodal?

Yes. GPT-5.6 Sol supports text and image input.

Tools that use GPT-5.6 Sol