{"slug":"opus-5-5","label":"Opus 5.5","item_count":7,"day_count":6,"source_count":6,"first_seen":"2026-09-22T17:28:01+00:00","last_updated":"2026-09-29T02:44:29+00:00","generated_at":"2026-10-07T10:03:49.735679+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":"Day-one Bedrock availability with Anthropic's positioning for agentic coding."},{"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 release next to OpenAI's GPT-6 Sol and Luna launched about 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 the 40-50% price cuts across vendors that followed the launch."}]},{"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 case that Opus 5.5 pricing is tuned 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 that identical token prices yield very different per-task costs depending on Claude Code settings."}]},{"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":"Adds Sonnet 5.5 as a lower-cost, faster option on Bedrock."}]},{"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":"First hands-on read of a specific capability: explainer-video generation."}]}],"editorial":{"tldr":"Anthropic released Claude Opus 5.5 on Sep 22, with same-day availability on Amazon Bedrock, and OpenAI answered about an hour later with GPT-6 Sol and Luna. Pricing cuts of 40-50% across vendors followed, and Anthropic then shifted its pitch to cost per task rather than token price.","stale":false,"whats_new":"Latent Space reports Opus 5.5 handles explainer-video generation well, an unusually concrete capability read that follows Anthropic's Sonnet 5.5 release on AWS on Sep 28.","why_it_matters":"Per-token price is no longer the comparison that matters: Anthropic's own cost-per-task analysis shows the same token price can produce very different Claude Code bills depending on settings.","take_for_builders":"Rerun your own agent workload on Opus 5.5 and Sonnet 5.5 and compare cost per completed task, not cost per token, before changing your default model.","status":{"state":"Shipping","tone":"rising","changed":"2026-09-29","detail":"Opus 5.5 is generally available on AWS and Anthropic's platform, with Sonnet 5.5 added the following week; independent capability reads are still accumulating.","track":[{"label":"launch + price war","detail":"Sep 22–23","tone":"launch","weight":30},{"label":"cost-per-task framing","detail":"Sep 24–25","tone":"turn","weight":30},{"label":"Sonnet 5.5 + hands-on","detail":"Sep 28 → now","tone":"now","weight":40}]},"beats":[{"kicker":"LAUNCH","tone":"launch","headline":"Opus 5.5 ships on Bedrock the day Anthropic announces it, minutes before GPT-6 Sol and Luna","summary":"Anthropic positions Opus 5.5 for agentic coding and long-running tasks; OpenAI releases two GPT-6 models about an hour later.","sids":["7322241f50811c86","73461b3e97af0d93"]},{"kicker":"PRICE WAR","tone":"rising","headline":"Vendors cut prices 40-50% and Opus 5.5 becomes AINews's default model","sids":["19163c30f0a4c925"]},{"kicker":"THE TURN","tone":"turn","headline":"Anthropic argues for cost per task over token price","summary":"Two Claude blog posts tie Opus 5.5 pricing to longer, context-heavy coding sessions and show which Claude Code settings change the bill.","sids":["a26eb8af87253d8b","3d1eacfa6636ae86"]},{"kicker":"NOW","tone":"now","headline":"Sonnet 5.5 lands on AWS and Opus 5.5 gets its first niche capability read","sids":["09e1fe5d7a6f40d9","ac41a808ac11619d"]}],"open_questions":["Do independent benchmarks confirm Anthropic's lower cost per task for Opus 5.5 versus GPT-6 Sol?","Do the 40-50% price cuts hold, or are they tied to launch promotions?","Does Sonnet 5.5 undercut Opus 5.5 on cost per task for coding workloads?"],"generated_at":"2026-10-07T10:03:34+00:00"}}