GPT-5.5

At a glance

What it costs

You pay for the tokens each reply actually uses, at OpenAI’s price plus the 25% platform fee. Before you send, the composer shows an estimate, and every reply shows what it cost.

Usage comes out of the credit included with your plan, then any top-up. See plans and every model’s price.

The model you pick is the model that answers

Every reply is labeled with the model that actually wrote it. If GPT-5.5 can’t answer and Knecty uses another model, the reply says so.

Read more: The "Served by" guarantee · Models available in your region · Help centre · Pricing

• GPT-5.6 TerraGPT-5.6 balanced tierPremiumExtended thinking$2.50 in · $15.00 out per 1M tokens
• GPT-6 AstraOpenAI’s newest flagship — deepest reasoningPremiumExtended thinking$12.50 in · $62.50 out per 1M tokens
• GPT-5.6 LunaGPT-5.6 fast tier — great valuePremiumExtended thinking$0.25 in · $1.50 out per 1M tokens
• GPT-5.5 ProMaximum-effort reasoning tierPremiumExtended thinking$37.50 in · $225.00 out per 1M tokens
• GPT Image 1.5Image generation$0.08 per image
• GPT-5.6 SolGPT-5.6 mid flagship — strong reasoning valuePremiumExtended thinking$5.00 in · $25.00 out per 1M tokens
• GPT-5.4Previous flagship — still excellent valuePremiumExtended thinking$3.125 in · $18.75 out per 1M tokens
• GPT-5.3 CodexSpecialist for writing and fixing codePremiumExtended thinking$2.1875 in · $17.50 out per 1M tokens
• GPT Image MiniImage generation$0.03 per image
• GPT-5.4 MiniSnappy, general-purposePremium$0.9375 in · $5.625 out per 1M tokens
• GPT-5.4 NanoOpenAI’s lightest, quickest tierFast$0.25 in · $1.5625 out per 1M tokens