LLM API Price Changes

Dated, sourced price changes. Every entry links to the provider's official changelog or pricing page.

This page tracks material price changes that affect the effective cost used by the TokenMeter calculator. We log only what we can cite to a primary source (provider changelog/pricing). If a number changed but no dated public statement exists, we do not guess.

How we track changes

Source-first: every entry cites an official provider URL (changelog, release notes, or pricing page).
Dated: we record the date the change was announced/published by the provider.
Actionable: we log the specific models/fields affected (input/cached/cache-write/output/long-tier).
Conservative: unverified context-window values are never backfilled from changelogs.

2026

Date	Provider	Change	Source
2026-10-07	Anthropic	Prompt cache reads on Claude Sonnet 5.5 reduced from $0.20 → $0.10/MTok (0.05× base input, down from 0.10×). Cache writes and all other prices unchanged.	Anthropic API Release Notes
2026-10-07	OpenAI	Three models added and six context windows corrected in dataset (separate from provider price changes). See methodology.	OpenAI Pricing, OpenAI Models
2026-09-01	Anthropic	Introductory pricing for Claude Sonnet 5 ($2/$10/MTok) made the standard price; previously scheduled increase to $3/$15 on 2026-09-01 did not occur.	Anthropic API Release Notes, Anthropic Pricing
2026-07-30	OpenAI	"Priority processing" renamed to Fast mode (naming change only; pricing behavior unchanged by this rename).	OpenAI Pricing
2026-07-24	Anthropic	Claude Opus 5 launched (1M context window; pricing as published). Tracked in dataset at time of verification.	Anthropic API Release Notes
2026-07-30	OpenAI	GPT-5.6 family price cut context (documented in dataset notes). See provider pricing for current rates.	OpenAI Pricing
2026-06-30	Anthropic	Claude Sonnet 5 launched at introductory pricing ($2/$10/MTok); later made standard (2026-08-10).	Anthropic API Release Notes
2026-01-01	Google	Several Gemini Flash/Pro TTS/text tiers move from introductory rates (through 2026-12-31) to standard rates effective 2027-01-01 (many models double). These are promo expiry events, not cuts/increases today.	Google Gemini API Pricing
2026-11-21	OpenAI	GPT-5.6 Sol promotional pricing available at least through 2026-11-21 (as stated on OpenAI pricing). Dataset marks `promoEnd: "Nov 21, 2026"`.	OpenAI Pricing

Notes: Dates follow ISO YYYY-MM-DD for unambiguous sorting. Promotional expiries are included here when the provider states a firm date. TokenMeter shows promo flags and end dates directly in the calculator table where they apply.

Last updated: 7 October 2026 · Built for the 21-day measurement window; will ship with the competitive batch on 19 October 2026.