Claude Opus 5. 5 vs GPT-6 Sol: The September 2026 AI Price War, Explained On 22 September 2026, something unusual happened: Anthropic and OpenAI launched new AI models within roughly an hour of each other. Anthropic released Claude Opus 5.
Source: [Dev.to](https://dev.to/huzdev224/claude-opus-55-vs-gpt-6-sol-the-september-2026-ai-price-war-explained-2hia)