OpenAI doubles flagship API token prices with GPT-5.5: $2.50/$15 to $5.00/$30 per 1M tokens

Receipt category is price-increase on the API surface: the flagship per-token rate doubled generation-over-generation.

Receipt category is price-increase on the API surface: the flagship per-token rate doubled generation-over-generation. The AFTER prices ($5.00 input / $30.00 output per 1M tokens) are confirmed verbatim from OpenAI's official API pricing page and the GPT-5.5 model docs. The BEFORE prices for GPT-5.4 ($2.50 input / $15.00 output per 1M tokens) are corroborated by multiple independent pricing trackers and OpenRouter's launch cost analysis but are no longer shown on OpenAI's live pricing page (GPT-5.4 was superseded by GPT-5.5), so the before-figure is sourced to those trackers rather than to OpenAI's current page. PENDING EVIDENCE: an archived OpenAI pricing snapshot showing the GPT-5.4 $2.50/$15 rate prior to 2026-04-23 has not yet been captured to first-party-confirm the before-side; the 2x framing and after-side are first-party-confirmed. Quoted price line from OpenAI's pricing page: GPT-5.5 'Input $5.00 / 1M tokens, Output $30.00 / 1M tokens.'