{"slug":"claude-5-5","label":"Claude 5.5","item_count":8,"day_count":7,"source_count":6,"first_seen":"2026-09-22T17:28:01+00:00","last_updated":"2026-10-07T20:56:21+00:00","generated_at":"2026-10-08T00:03:42.755378+00:00","sources":["aws_ml_blog","claude_blog","claude_dev_blog","latent_space","openai_blog","simon_willison"],"days":[{"date":"2026-09-22","items":[{"title":"Claude Opus 5.5 is now available on AWS","url":"https://aws.amazon.com/blogs/machine-learning/claude-opus-5-5-is-now-available-on-aws","source":"aws_ml_blog","type":"news","summary_1line":"Claude Opus 5.5, Anthropic's most capable Opus model for agentic coding, knowledge work, and long-running tasks, is now available on Amazon Bedrock and Claude Platform on AWS. This post covers what's new in Opus 5.5,...","why_it_matters":"Matches feed focus: agentic.","sid":"7322241f50811c86","published":"2026-09-22T17:28:01+00:00","editor_note":"Opus 5.5 available on Bedrock and Claude Platform on AWS."},{"title":"Claude Opus 5.5, GPT-6 Sol, GPT-6 Luna, and a new price war","url":"https://simonwillison.net/2026/Sep/22/opus-and-sol-and-luna","source":"simon_willison","type":"news","summary_1line":"Yesterday was Grok 4.7 ( pelicans ) and MiMo v2.6 Flash/Pro ( more pelicans ). Today Anthropic released Claude Opus 5.5 , and around an hour later OpenAI released GPT-6 Sol and GPT-6 Luna . It's going to take a while...","why_it_matters":"Matches feed focus: agentic, codex, claude code.","sid":"73461b3e97af0d93","published":"2026-09-22T18:00:00+00:00","sources":["openai_blog","simon_willison"],"editor_note":"Places the launch next to OpenAI's GPT-6 Sol and Luna an hour later."}]},{"date":"2026-09-23","items":[{"title":"[AINews] Claude Opus 5.5, the new default model for AINews — and everybody cuts prices 40-50%","url":"https://www.latent.space/p/ainews-claude-opus-55-the-new-default","source":"latent_space","type":"news","summary_1line":"overshadowing more efficient GPT6 models from OpenAI","sid":"19163c30f0a4c925","published":"2026-09-23T06:41:41+00:00","editor_note":"Reports 40-50% price cuts across vendors."}]},{"date":"2026-09-24","items":[{"title":"Coding sessions are longer and use more context. Claude Opus 5.5 is built with that in mind. | Claude by Anthropic","url":"https://claude.com/blog/claude-opus-5-5-built-for-coding-sessions-that-use-more-context","source":"claude_blog","type":"news","summary_1line":"Our latest Opus model is priced and trained to optimize costs for how developers code now.","sid":"a26eb8af87253d8b","published":"2026-09-24T00:00:00+00:00","editor_note":"Anthropic's pitch: Opus 5.5 is priced and trained for longer, context-heavy coding sessions."}]},{"date":"2026-09-25","items":[{"title":"What a task costs on Opus 5.5 / claude.dev Blog","url":"https://claude.com/blog/what-a-task-costs-on-opus-5-5","source":"claude_blog","type":"news","summary_1line":"The same token price can cost very different amounts per task. Learn what Claude Code tasks cost on Opus 5.5 and which settings change the bill.","why_it_matters":"Matches feed focus: claude code.","sid":"3d1eacfa6636ae86","published":"2026-09-25T12:00:00+00:00","editor_note":"Shows identical token prices yield different per-task bills, and which settings change them."}]},{"date":"2026-09-28","items":[{"title":"Introducing Claude Sonnet 5.5 on AWS","url":"https://aws.amazon.com/blogs/machine-learning/introducing-claude-sonnet-5-5-on-aws","source":"aws_ml_blog","type":"news","summary_1line":"Claude Sonnet 5.5 is now available on Amazon Bedrock and Claude Platform on AWS. It's a smarter, more efficient Sonnet model for focused coding and knowledge work, with a lower cost per task at faster speed. This post...","sid":"09e1fe5d7a6f40d9","published":"2026-09-28T12:00:00+00:00","sources":["aws_ml_blog","claude_dev_blog","simon_willison"],"editor_note":"Sonnet 5.5 arrives with lower cost per task at faster speed."}]},{"date":"2026-09-29","items":[{"title":"[AINews] Opus 5.5 is good at explainer videos","url":"https://www.latent.space/p/ainews-opus-55-is-good-at-explainer","source":"latent_space","type":"news","summary_1line":"a rare feature of a capability","sid":"ac41a808ac11619d","published":"2026-09-29T02:44:29+00:00","editor_note":"Early hands-on: Opus 5.5 is good at explainer videos."}]},{"date":"2026-10-07","items":[{"title":"Claude Haiku 5.5","url":"https://simonwillison.net/2026/Oct/7/claude-haiku-5-5","source":"simon_willison","type":"news","summary_1line":"As previously promised , here's Anthropic's new fast, low cost model: Introducing Claude Haiku 5.5 . The previous Haiku, 4.5, was very much showing its age. It came out almost a year ago , and was priced at $1/million...","why_it_matters":"Matches feed focus: codex.","sid":"fdc864340b44ea6e","published":"2026-10-07T20:56:21+00:00","editor_note":"Haiku 5.5 replaces the nearly year-old Haiku 4.5."}]}],"editorial":{"tldr":"Claude Opus 5.5 shipped Sep 22 on AWS and direct, an hour before OpenAI's GPT-6 Sol and Luna, and the launch coincided with 40-50% price cuts across vendors. Sonnet 5.5 followed Sep 28 with a lower cost per task.","stale":false,"whats_new":"Anthropic released Claude Haiku 5.5 on Oct 7, completing the 5.5 lineup with a fast, low-cost model to replace Haiku 4.5, which was nearly a year old.","why_it_matters":"The 5.5 family now covers all three tiers, so model-routing and cost-per-task evals can be rerun across Opus, Sonnet and Haiku against the new price floor.","take_for_builders":"Rerun your routing evals with Haiku 5.5 on the cheap tier and compare cost per completed task, not per-token price, against Sonnet 5.5.","status":{"state":"Shipping · full lineup","tone":"now","changed":"2026-10-07","detail":"Opus, Sonnet and Haiku 5.5 are all released.","track":[{"label":"Opus","detail":"Sep 22","tone":"launch","weight":40},{"label":"Sonnet","detail":"Sep 28","tone":"rising","weight":35},{"label":"Haiku","detail":"Oct 7","tone":"now","weight":25}]},"beats":[{"kicker":"LAUNCH","tone":"launch","headline":"Opus 5.5 ships alongside GPT-6 Sol and Luna","summary":"Availability on AWS and a same-day OpenAI release set off a price war.","sids":["7322241f50811c86","73461b3e97af0d93","19163c30f0a4c925"]},{"kicker":"COST","tone":"rising","headline":"Anthropic details what tasks cost on Opus 5.5","summary":"Per-task cost, not token price, is the framing.","sids":["a26eb8af87253d8b","3d1eacfa6636ae86"]},{"kicker":"SONNET","tone":"rising","headline":"Sonnet 5.5 lands on AWS; Opus 5.5 gets hands-on praise","sids":["09e1fe5d7a6f40d9","ac41a808ac11619d"]},{"kicker":"NOW","tone":"now","headline":"Haiku 5.5 completes the lineup","sids":["fdc864340b44ea6e"]}],"open_questions":["How does Haiku 5.5 pricing compare with Haiku 4.5's $1 per million input tokens?","Do the Sep 22 vendor price cuts hold through Q4?"],"provenance":{"09e1fe5d7a6f40d9":{"verified":2}},"generated_at":"2026-10-08T00:03:38.046831+00:00"}}