OpenAI · GPT-6
GPT-6 Sol
OpenAI's everyday reasoning model for complex coding and agentic workflows, released 22 September 2026 as the successor to GPT-5.6 Sol at roughly half its promotional API price. GPT-5.6 Sol remains available during the rollout.
Start here
- What this helps you do
- Decide whether GPT-6 Sol is the right model for a job you have, or one to leave alone.
- What you leave with
- A plain read of what GPT-6 Sol is for, what to avoid giving it, and the facts behind that.
- What to check before trusting it
- Released 22 September 2026, so real-world track record is minimal at review time.
Treat this as a migration decision from GPT-5.6 Sol, not a fresh evaluation. Run the same task through both at the same effort setting and compare quality against the roughly 50% price drop before moving anything in production.
Use it for
- Complex coding and agentic workflows in ChatGPT Work or Codex
- Multi-step analysis where GPT-5.6 Sol was the previous choice
- API work that wants Astra-line quality at a lower per-token price
Skip it for simple lookups and quick edits where Luna or a lighter model already succeeds, and do not switch a production workflow off GPT-5.6 Sol before comparing quality, not just price.
Effort without the jargon
Start with the default reasoning effort and raise it only when a task genuinely needs deeper planning or analysis.
Advanced recordCost, limits, privacy and operations
The price drop against GPT-5.6 Sol is real and roughly half, but reliability and communication-quality claims are OpenAI's own; test on your actual task before moving a working GPT-5.6 Sol workflow.
- API cost
- Officially disclosedOpenAI API price: $2 per million input tokens, $0.20 cached input, $2.50 per million cache-write tokens and $10 per million output tokens, roughly half GPT-5.6 Sol's promotional $4/$0.40/$20 rate.
- Context window
- Officially disclosed1,050,000 tokens
- Maximum output
- Officially disclosed128,000 tokens
- Knowledge cutoff
- Officially disclosed20 April 2026
- Recorded inputs
- Not enumerated in cited record
- Recorded output
- Text
Data handling is a product decision
Depends on surfaceRetention and training rules belong to the ChatGPT plan, API account and workspace, not the model name alone; the cited model page does not restate them.
Operational constraints
- Released 22 September 2026, so real-world track record is minimal at review time.
- GPT-5.6 Sol, Terra and Luna remain available during the rollout, so this is not a forced migration.
- Reliability and communication-quality comparisons against GPT-5.6 Sol are OpenAI's own framing and were not independently verified at review time.
- The cited model page does not enumerate input modalities beyond text; treat image input as unconfirmed until checked against a live request.
Record details
- Evidence readiness
- informational
- Guidance confidence
- moderate
- Evidence revision
- gpt-6-sol@v1
Unknown means the cited official record does not disclose a safe value. It is not an estimate. Prices are provider list prices in USD where stated and can change before this record's review date.
Keep the evidence separate
OpenAI describes GPT-6 Sol as built for complex coding and agentic workflows, with stronger factual reliability and clearer communication than GPT-5.6 Sol, built on the advances behind GPT-6 Astra brought into a faster, more affordable model.
No sufficiently useful independent note has been added yet. That absence is not filled with our guess.
No Human Bit result is claimed; use this as evaluation guidance only.
Not scheduled
No Human Bit result is claimed for this model yet.