OpenAI gpt-6.1-sol and more

POST https://openai.mm.family/x402/v1/chat/completions

gpt-6.1-sol (OpenAI's newest model) and 25 more OpenAI chat models (gpt-6, gpt-6.1, gpt-5.6, gpt-5.5, gpt-5.4, gpt-5.x, gpt-4.1, gpt-4o, o-series) via x402 at OpenAI list rates, plus $0.0025 per call on Base or $0.002 on Solana, paid in USDC on Base or Solana. Three speeds where OpenAI offers them: Flex (half of list, default where available; may answer 429), Standard (service_tier default), Fast (service_tier fast). The quote is an upper bound from max_tokens (default 1024). Payment is taken when the first token arrives, when the answer is complete, or after 30 s if the model is still reasoning; long reasoning can take minutes after that, so use stream:true or a long client timeout. Reasoning models: temperature must be 1. Model keys take a :level suffix for reasoning_effort (levels in /x402/v1/models); reasoning tokens are billed as output, so send max_tokens >= 128 or a low level for short answers. Sheet: https://openai.mm.family/x402/pricing. Each model also has its own endpoint: P