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curl https://aihubmix.com/v1/chat/completions \-H "Authorization: Bearer sk-***" \-H "Content-Type: application/json" \-d '{"model": "gpt-5.5","messages": [{"role":"user","content":"Hi"}]}' # claude-opus-4-7 / gemini-3.1-pro-preview
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Recent Blog Posts
Migrating to GPT-6.1 Sol: 9 Things That Can Go Wrong
Moving from GPT-6 Sol to 6.1 Sol looks like a one-line change, and the price is the same. But there are a few breaking changes and some shifts in behavior, so changing only the model name can get you errors, a surprise bill, or an agent that behaves differently. OpenAI's GPT-6 migration guide covers most of the official changes. This post adds the things that tend to bite in practice. They're ordered from "fails loudly" to "fails quietly." 1. reasoning_effort: "none" returns a 400 What you'l
What GPT-6.1 Sol Really Costs: Beyond the $2 / $10 Price Tag
GPT-6.1 Sol has the same list price as GPT-6 Sol: $2 per million input tokens and $10 per million output tokens. Your actual bill depends on four other things: how often you hit the cache, whether you cross 272K input tokens, which service tier you use, and how many reasoning tokens the model burns. This post goes through each one. The full price list Standard rates (per 1M tokens) GPT-6.1 SolGPT-6 SolGPT-6 AstraGPT-6 LunaInput$2.00$2.00$10.00$0.10Cached input$0.10$0.20$1.00—Cache writes$
Choosing a Reasoning Effort for GPT-6.1 Sol: low to max
GPT-6.1 Sol has five reasoning effort levels: low, medium (the default), high, xhigh, and max. The big change from GPT-6 Sol is that none and minimal are gone, so low is now the floor. This one setting drives both latency and cost. You never see reasoning tokens, but you pay for them at the output rate ($10 per million for 6.1 Sol on AIHubMix), and they take up room in the context window. Pick the wrong level and you can easily pay several times more than you need to. What each level is for
