GPT-5.6 Sol is OpenAI’s flagship GPT-5.6 model in Cursor. It is the strongest of the Sol, Terra, and Luna family: persistent on long-running agent work, fast enough for interactive sessions, and notably concise in how it communicates.

Strengths

  • Highest intelligence in the GPT-5.6 family for challenging coding and reasoning tasks.
  • Strong persistence on long-running work; it keeps going through multi-hour agent sessions instead of stopping early.
  • Clean, direct communication with less comment and final-message slop than many Claude models.
  • Concise and easy to skim; strong as a rubber-duck partner for planning and debugging.
  • Competitive speed relative to similarly intelligent models.

Limitations

  • Higher per-token pricing than Terra and Luna.
  • Can over-use subagents on mid-sized tasks.
  • Sometimes waits for an explicit “do it” after agreeing with feedback, instead of executing immediately.
  • Instruction-following can lag the strongest Claude models on some agent behavior evals.

Tools

GPT-5.6 Sol has access to all agent tools when used with Cursor including:

Learn more about how tools work and tool calling fundamentals.

Pricing

Cursor plans include two usage pools. GPT-5.6 Sol draws from the third-party Other Models pool, which charges at the rates below. All prices are per million tokens.

A Fast mode tier (gpt-5.6-sol-fast) is available for priority processing at 2x the standard rates.

When input exceeds 272k tokens (long context), input pricing doubles and output pricing is 1.5x the standard rate.