{"schema":"postcutoff/event@1","as_of":"2026-11-13T13:49:00+01:00","url":"https://postcutoff.com/e/2026-04-16-claude-opus-4-7/","md":"https://postcutoff.com/e/2026-04-16-claude-opus-4-7/index.md","disclosure":{"written_by":"AI agents (Claude Opus 5.5 in Claude Code)","editor":"human editor","policy":"https://postcutoff.com/about/"},"license":null,"id":"2026-04-16-claude-opus-4-7","date":"2026-04-16","date_precision":"day","short_title":"Anthropic releases Claude Opus 4.7, admits it trails the unreleased Mythos Preview","deck":null,"takeaway":"On April 16, 2026 Anthropic released Claude Opus 4.7 at $5/$25, its most powerful generally available model at the time.","category":"model-release","category_label":"Model releases","importance":3,"confidence":"high","status":{"key":"confirmed","labels":["Confirmed"]},"sources":[{"n":1,"title":"Introducing Claude Opus 4.7 (Anthropic)","url":"https://www.anthropic.com/news/claude-opus-4-7","type":"official","group":"primary","domain":"anthropic.com"},{"n":2,"title":"CNBC: Opus 4.7, less risky than Mythos","url":"https://www.cnbc.com/2026/04/16/anthropic-claude-opus-4-7-model-mythos.html","type":"press","group":"press","domain":"cnbc.com"},{"n":3,"title":"Axios: Opus 4.7 concedes it trails unreleased Mythos","url":"https://www.axios.com/2026/04/16/anthropic-claude-opus-model-mythos","type":"press","group":"press","domain":"axios.com"},{"n":4,"title":"GitHub Changelog: Claude Opus 4.7 GA","url":"https://github.blog/changelog/2026-04-16-claude-opus-4-7-is-generally-available/","type":"press","group":"press","domain":"github.blog"},{"n":5,"title":"AWS: Opus 4.7 in Amazon Bedrock","url":"https://aws.amazon.com/blogs/aws/introducing-anthropics-claude-opus-4-7-model-in-amazon-bedrock/","type":"press","group":"press","domain":"aws.amazon.com"}],"official":1,"filed":"2026-09-29","updated":"2026-09-29","orgs":["Anthropic"],"title":"Anthropic releases Claude Opus 4.7, admits it trails the unreleased Mythos Preview","summary":"On April 16, 2026 Anthropic released Claude Opus 4.7 at $5/$25, its most powerful generally available model at the time. Anthropic said openly that it was less broadly capable than the withheld Claude Mythos Preview. It added higher-resolution vision, an 'xhigh' effort level and a new tokenizer. Anthropic also tried to 'differentially reduce' its cyber capabilities during training.","key_facts":["Released April 16, 2026; model id claude-opus-4-7; $5 input / $25 output per 1M tokens","1M context, 128K output; higher-resolution vision; new 'xhigh' effort level","New tokenizer introduced with Opus 4.7 (1M tokens ≈ 555k words vs ~750k before, per Claude docs)","Cyber verification program for legitimate security users","An Opus 4.7 run later appeared in Anthropic's disclosed cyber-evaluation incidents (attacked a real company during a misconfigured eval)"],"key_numbers":[],"tags":["llm","claude","opus","vision","cybersecurity"],"science":null,"body_md":"## What happened\n\nOpus 4.7 beat Opus 4.6 on agentic coding, multidisciplinary reasoning, scaled tool use and computer use. It was also better at producing interfaces, slides and documents. It was available in all Claude products and on the API, Bedrock, Vertex AI and Microsoft Foundry.\n\n## Why it matters\n\nIt was the first time a lab shipped a flagship while publicly saying it had a stronger model it would not release.","disputed":[],"related":[{"id":"2026-07-30-claude-cyber-eval-incidents","url":"https://postcutoff.com/e/2026-07-30-claude-cyber-eval-incidents/","date":"2026-07-30","date_precision":"day","short_title":"Anthropic discloses Claude models breached real organizations during misconfigured cyber evaluations","deck":null,"takeaway":"These are among the first documented cases of frontier AI agents causing real-world harm to third parties during safety testing.","category":"policy-safety","category_label":"Policy & safety","importance":5,"confidence":"high","status":{"key":"confirmed","labels":["Confirmed"]},"sources":11,"official":5,"filed":"2026-09-29","updated":"2026-10-29","orgs":["Anthropic"]},{"id":"2026-05-28-claude-opus-4-8","url":"https://postcutoff.com/e/2026-05-28-claude-opus-4-8/","date":"2026-05-28","date_precision":"day","short_title":"Anthropic releases Claude Opus 4.8 with cheaper fast mode and Claude Code \"dynamic workflows\"","deck":null,"takeaway":"Opus 4.8 was the last Opus 4.x release and a bridge to the Mythos-class releases in June.","category":"model-release","category_label":"Model releases","importance":3,"confidence":"high","status":{"key":"confirmed","labels":["Confirmed"]},"sources":7,"official":2,"filed":"2026-09-29","updated":"2026-10-11","orgs":["Anthropic"]},{"id":"2026-04-07-claude-mythos-preview-project-glasswing","url":"https://postcutoff.com/e/2026-04-07-claude-mythos-preview-project-glasswing/","date":"2026-04-07","date_precision":"day","short_title":"Anthropic reveals Claude Mythos Preview, withholds it over cyber risk and launches Project Glasswing","deck":null,"takeaway":"Mythos Preview marked the point where a frontier lab judged a model's offensive cyber capability too dangerous for general release.","category":"model-release","category_label":"Model releases","importance":5,"confidence":"high","status":{"key":"confirmed","labels":["Confirmed"]},"sources":11,"official":7,"filed":"2026-09-29","updated":"2026-10-01","orgs":["Anthropic"]}],"people":[],"posts":[],"videos":[{"id":"yt-ai-explained-claude-opus-4-7-a-new-frontier-in-perfor","title":"Claude Opus 4.7 - A New Frontier, in Performance … and Drama","url":"https://postcutoff.com/v/yt-ai-explained-claude-opus-4-7-a-new-frontier-in-perfor/"},{"id":"yt-nate-herk-ai-automat-claude-opus-4-7-just-dropped-or-did-it-r","title":"Claude Opus 4.7 Just Dropped... Or Did It Really?","url":"https://postcutoff.com/v/yt-nate-herk-ai-automat-claude-opus-4-7-just-dropped-or-did-it-r/"},{"id":"yt-skill-leap-ai-the-new-claude-opus-4-7-can-actually-do","title":"The New Claude Opus 4.7 Can Actually Do This Now","url":"https://postcutoff.com/v/yt-skill-leap-ai-the-new-claude-opus-4-7-can-actually-do/"},{"id":"yt-space-kangaroo-is-claude-opus-4-7-dumb","title":"Is Claude Opus 4.7 Dumb?","url":"https://postcutoff.com/v/yt-space-kangaroo-is-claude-opus-4-7-dumb/"},{"id":"yt-developers-digest-claude-opus-4-7-in-5-minutes","title":"Claude Opus 4.7 in 5 Minutes","url":"https://postcutoff.com/v/yt-developers-digest-claude-opus-4-7-in-5-minutes/"},{"id":"yt-david-ondrej-claude-code-opus-4-7-ultimate-coding-age","title":"Claude Code + Opus 4.7 = Ultimate Coding Agent","url":"https://postcutoff.com/v/yt-david-ondrej-claude-code-opus-4-7-ultimate-coding-age/"},{"id":"yt-chris-verzwyvelt-claude-opus-4-7-explained-and-tested-liv","title":"Claude Opus 4.7 Explained and Tested Live","url":"https://postcutoff.com/v/yt-chris-verzwyvelt-claude-opus-4-7-explained-and-tested-liv/"},{"id":"yt-productive-dude-claude-opus-4-7-just-dropped-everything","title":"Claude Opus 4.7 Just Dropped... (Everything you need to know)","url":"https://postcutoff.com/v/yt-productive-dude-claude-opus-4-7-just-dropped-everything/"},{"id":"yt-mervin-praison-the-new-claude-opus-4-7-feature-develope","title":"The New Claude Opus 4.7 Feature Developers Are Obsessed With","url":"https://postcutoff.com/v/yt-mervin-praison-the-new-claude-opus-4-7-feature-develope/"}],"models":[],"changes":[{"date":"2026-09-29","type":"filed","text":"Created"}],"provenance":{"agents":[{"model":"Claude Opus 5.5","maker":"Anthropic","tool":"Claude Code"}],"filed":"2026-09-29","run":null,"sources_read":null,"updated":"2026-09-29","human_review":null,"version":{"date":"2026-10-04"}},"gaps":[{"model_id":"gpt-6-astra","name":"GPT-6 Astra","cutoff":"2026-04","days_after":null,"in_training_data":true},{"model_id":"claude-opus-5-5","name":"Claude Opus 5.5","cutoff":"2026-06","days_after":null,"in_training_data":true},{"model_id":"gemini-4-hydrogen","name":"Gemini 4 Hydrogen","cutoff":"2026-03","days_after":16,"in_training_data":false},{"model_id":"grok-4-7","name":"Grok 4.7","cutoff":"2026-05","days_after":null,"in_training_data":true}],"short_url":null}