OCT 08 2026
Anthropic completes the Claude 5.5 family with Haiku 5.5
Per Anthropic's own announcement, Haiku 5.5 is "the cheapest, fastest, and most capable small model" it has released, priced at $0.10 per million input tokens and $0.50 per million output under 100K tokens. Anthropic also halved cache-read pricing on Sonnet 5.5, cutting typical agentic-work costs by about 20%. Haiku 5.5 is live now on Claude's platform, AWS, Google Cloud and Azure.
Source: sg.finance.yahoo.com/news/anthropic-expands-ai-model-suite-…
Full brief, OCT 08 2026
SEP 29 2026
Anthropic ships Claude Sonnet 5.5, the second model in the 5.5 family
Per Anthropic's own announcement, Sonnet 5.5 is priced the same as Sonnet 5 ($2/$10 per million tokens) but runs about 30% faster and uses meaningfully fewer tokens per task, coming close to Opus 5.5's performance on several benchmarks despite being the cheaper, mid-tier option. It's live now on the Claude Platform, AWS, Google Cloud and Azure; Claude Haiku 5.5 is coming "in the following weeks" to complete the family.
Source: anthropic.com/claude-sonnet-5-5
Full brief, SEP 29 2026
SEP 23 2026
Anthropic ships Claude Opus 5.5, its first release since calling for "pacing the frontier"
Per Anthropic's own announcement (via TechCrunch), Opus 5.5 was tested before release by external evaluators including Frontier Design and METR, and scored as "the strongest-performing model we've tested to date" on Anthropic's automated behavioral audit. Pricing dropped to $4/$20 per million tokens, a 20% cut from Opus 5, with cache reads down 60%.
Source: techcrunch.com/2026/09/22/anthropic-releases-opus-5-5-with-…
Full brief, SEP 23 2026