OpenAI’s GPT-6 Sol (Medium) can be selected in Arena Direct Mode for the next 24 hours, through Sept. 29 at 9am PT. Arena.ai says it will remain available in Battle and Agent Mode after that window.
OpenAI Developers says a bug that degraded image understanding in GPT-6 Sol and GPT-6 Luna has been fixed, and visual tasks in the API and Codex, including computer use, should now return better results.
Arena.ai says OpenAI’s GPT-6 Sol (Max) recorded a +7.7% net improvement across 4,000+ real-world agentic sessions, at a median cost of $0.75 per task. It trails Claude Fable 5 (High) by 0.60 percentage points while costing 56% less per task.
Arena.ai reports a +7.7% net improvement and sixth place for GPT-6 Sol (Max) across 4,000+ real-world agentic sessions. Versus GPT-5.6 Sol (xHigh), that is up from +6.2% and eighth, at half the per-token price.
Arena.ai says it has generated side-by-side outputs from Anthropic’s Claude Opus 5.5 and OpenAI’s GPT-6 Sol, and that scores for Claude Opus 5.5 are coming soon.
Arena.ai reports that OpenAI’s GPT-6 Sol (Max) scored 1,689 points and placed fourth in Code Arena: WebDev, at a blended price of $8 per million tokens. It is 72 points above GPT-5.6 Sol (xHigh), while Arena.ai says GPT-6 Luna’s score is still pending.
OpenCode now offers GPT 6 Sol, Luna and Opus 5.5. No pricing, limits, or eligibility conditions are stated.
Pi says the three models are available on Radius at radius.earendil.com.
GPT-6 Sol can be used in Perplexity and Computer, where it is the default Light option in the effort selector.
GPT-6 Sol and GPT-6 Luna build on advances behind GPT-6 Astra as faster, more affordable models for work at scale. OpenAI says more efficient caching and inference are reflected in API prices 50% lower than GPT-5.6 promotional pricing.
Lovable says GPT-6 Sol scores 6 to 12% higher than GPT-5.6 Sol at every effort level on its 0-to-1 building benchmark, with larger gains in intent alignment and design fundamentals.