AI price and limit changelog: every dated change, sourced

Google released Gemini 4 Argon to developers on October 13, 2026, at an introductory $2 per million input tokens and $10 per million output through November 30, then $4 and $20. (Google: Gemini 4 Argon, built to solve your hardest problems)

Anthropic released Claude Haiku 5.5 on October 7, 2026, at $0.10 per million input tokens and $0.50 per million output tokens for prompts up to 100,000 tokens, a tenth of Haiku 4.5's price. (Anthropic: Introducing Claude Haiku 5.5)

OpenAI reopened Pro 200 to new subscribers, with a lower usage allowance for those not eligible for grandfathering, and added Pro 500 at $500 a month with Astra Ultrafast. (OpenAI Help Center: About ChatGPT Pro tiers)

At DevDay 2026 on September 29, OpenAI released GPT-6.1 Sol, an upgrade to GPT-6 Sol at the same API price: $2 per million input tokens and $10 per million output. (OpenAI: Introducing GPT-6.1 Sol)

Anthropic released Claude Sonnet 5.5 on September 28, 2026, at $2 per million input tokens and $10 per million output tokens, the same price as Sonnet 5. (Anthropic: Introducing Claude Sonnet 5.5)

Since September 23, 2026, Anthropic's Claude Marketplace puts more than 2,000 connectors and plugins, Claude-powered agents and products, and service partners in one place. (Anthropic: Claude Marketplace, one place to discover plugins, agents, and services from our partners)

GPT-6 Sol and GPT-6 Luna launched in Work and Codex, and OpenAI says they aren't yet in Chat. (OpenAI: Introducing GPT-6 Sol and Luna)

Anthropic released Claude Opus 5.5 on September 22, 2026, at $4 per million input tokens and $20 per million output tokens, 20% less than Opus 5. (Anthropic: Introducing Claude Opus 5.5)

Grok 4.7 came out on September 21, 2026, priced from $2 per million input tokens and $6 per million output tokens. (SpaceXAI: Introducing Grok 4.7)

OpenAI paused new sign-ups and upgrades to the $200 Pro tier; existing Pro $200 subscriptions kept renewing, and Pro $100 stayed open. (OpenAI Help Center: About ChatGPT Pro tiers (archived September 19, 2026))

At GPT-6 Astra's launch in Work and Codex, OpenAI gave eligible Plus, Pro and Business subscribers a saved reset on September 3 and 4, 2026, for the launch's delay. (OpenAI Help Center: Managing usage with GPT-6 Astra in Work and Codex)

Google launched Gemini 3.8 Flash on September 2, 2026 at an introductory $0.75 per million input tokens and $3.75 per million output; from January 1, 2027 it's $1.50 and $7.50, twice as much. (Google: Introducing Gemini 3.8 Flash and 3.8 Flash Cyber)

Anthropic's promotion that let Pro use Fable 5 within its weekly limits ended on July 19, 2026; since then Fable 5 and 5.1 are paid for separately on Pro, and stay part of Max. (Claude Help Center: Claude Fable models on your plan)

Gemini moved to compute-based limits that refresh every 5 hours up to a weekly limit, weighed by the prompt, the features used and the chat's length. (Gemini Apps Help: Changes to Gemini model access and limits)

ChatGPT Go free for 12 months in India ended. (OpenAI Help Center: ChatGPT release notes)

After launching in India in August 2025, ChatGPT Go rolled out everywhere ChatGPT is available, at $8 a month in the US. (OpenAI: Introducing ChatGPT Go, now available worldwide)

Perplexity Pro free for 12 months with Airtel in India ended. (Perplexity Help Center: Perplexity Pro Airtel promo)