Anthropic Releases Claude Sonnet 5.5 and Claude Opus 5.5 in Major September Update
Anthropic released Claude Sonnet 5.5 on September 28 and Claude Opus 5.5 on September 22, with Opus 5.5 priced 40% lower than its predecessor.
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Claude Sonnet 5.5 Released
Anthropicannounced Claude Sonnet 5.5 on September 28, 2026. The model maintains the same API pricing as Claude Sonnet 5 at $2 per million input tokens and $10 per million output tokens.
Claude Opus 5.5 Arrives with Significant Price Cut
Anthropic released Claude Opus 5.5 on September 22, 2026. The new version is approximately 40% cheaper than Claude Opus 5 at default pricing, making it a more accessible option for enterprise deployments.
Industry Context
BenchLM confirms that as of September 28, 2026, exactly 2 AI model releases occurred in the trailing 24-hour window: Claude Sonnet 5.5 from Anthropic and Eleven v4 and Eleven v4 Turbo from ElevenLabs. This represents continued competitive momentum across the AI model release cycle, with multiple vendors shipping updates within tight timeframes.
For more details on Claude Sonnet 5.5, Anthropic’s official announcement is available at https://www.anthropic.com/claude-sonnet-5-5.
Source: BenchLM