Anthropic Called for an AI Slowdown. Ten Days Later, It and OpenAI Raced to Cut Prices.
On Sept 12, 2026, Anthropic CEO Dario Amodei published an essay calling for industry-wide cooperation to decelerate frontier AI development for safety reasons, warning that 'swarms of rogue AI agents could take over the internet in as little as six months.' Sam Altman, Elon Musk and Demis Hassabis all made supportive statements the same day. Ten days later, on Sept 22, Anthropic released Claude Opus 5.5 (40% cheaper than Opus 5 on a typical workload) and OpenAI launched two new models, GPT-6 Sol and Luna, within minutes of Anthropic's announcement — Luna prices in at roughly 40x cheaper than Opus 5.5. CNBC's own framing: this was the 'first release since call for slowdown.'
Receipts
- primaryhttps://www.cnbc.com/2026/09/22/anthropic-openai-cheaper-ai-models.html
- alsohttps://decrypt.co/378986/openai-launches-gpt-6-sol-luna-anthropic-claude-opus-5-5
- alsohttps://venturebeat.com/technology/openai-releases-gpt-6-sol-and-luna-models-slashing-api-costs-50-or-more
- alsohttps://siliconangle.com/2026/09/22/anthropic-releases-claude-opus-5-5-and-openai-counters-with-two-cheaper-gpt-6-models/
- alsohttps://simonwillison.net/2026/Sep/22/opus-and-sol-and-luna/
- alsohttps://www.cbsnews.com/news/ai-slowdown-lawsuit-openai-anthropic-google/
Flagged:Primary is CNBC's piece, which is the one that explicitly frames the Sept 22 releases as 'the first release since call for slowdown' — the tension this card is built on. Pricing specifics ($4/$20 for Opus 5.5, $2/$10 for Sol, $0.10/$0.50 for Luna) are independently corroborated by Decrypt, VentureBeat, SiliconANGLE and Simon Willison's blog (a respected independent AI commentator), all published Sept 22. The Sept 12 Amodei essay and its exact 'rogue AI agents' quote are corroborated via CBS News's coverage of a separate class-action lawsuit (four paid subscribers suing Anthropic, OpenAI, xAI and Google over an alleged illegal slowdown pact) — that lawsuit itself is several days old by the time this card was built (filed ~Sept 18-19) and is not the card's primary hook, but it's the same underlying essay and is useful corroborating color for the timeline. The card's own math (Sept 12 to Sept 22 = 10 days; Luna at $0.10/$0.50 vs Opus 5.5 at $4/$20 = 40x cheaper on both input and output) was verified directly, not just copied from a single outlet's characterization.