Announced September 22, 2026, Claude Opus 5.5 cuts token pricing about 20% below Opus 5, runs more than 30% faster, debuts at #1 on the Artificial Analysis Intelligence Index, and ships with a new class of safeguards Anthropic says beat every model it has tested.
2026-09-22 · by Moe Ameen
Published 2026-09-22 · Updated
Short answer
Anthropic released Claude Opus 5.5 on September 22, 2026, the first model in its 5.5 family. It costs $4 per million input tokens and $20 per million output tokens, down from Opus 5's $5 and $25, and generates output more than 30% faster. Anthropic says it scored best of any model it has tested on its behavioral audit. It writes text and reads images, but makes no images or video.
Key takeaways
Anthropic released Claude Opus 5.5 on September 22, 2026, the first model in its new 5.5 family and the successor to Claude Opus 5 (API ID `claude-opus-5-5`). The pitch is cheaper, faster, and safer rather than a new headline capability. Anthropic priced it at $4 per million input tokens and $20 per million output tokens — roughly a 20% cut from Opus 5's $5 and $25 — with cache reads dropping to $0.20 per million (down about 60% from $0.50) and a higher-priced Fast mode at $8 in and $40 out. The company says the changes add up to about 40% lower cost on typical workloads, and that output generates more than 30% faster than Opus 5.
On performance, independent benchmarking site Artificial Analysis put Opus 5.5 at #1 on its Intelligence Index at launch, and Anthropic's own testing shows it leading Fable 5.1 in agentic coding, computer use, and knowledge work. Anthropic cited figures including 66.4% on Terminal-Bench 4.0 (agentic coding), an 1846 Elo on GDPval-AA v2.1 (knowledge work), and 81.8% partial success on OSWorld 2.1 (computer use).
It also featured a customer testimonial from Deloitte Consulting's CIO describing Opus 5.5 catching 72% of known bugs in code reviews at its lowest effort setting versus Opus 5's 56% at high effort, with fewer false alarms. Notably, Anthropic also cautioned that benchmark margins have become a less reliable guide to real-world differences at current capability levels, saying the practical gap between Opus 5.5 and Fable 5.1 is narrower than the scores suggest.
The launch leans heavily on safety. Anthropic says Opus 5.5 earned the best score of any model to date on its automated behavioral audit (roughly 2,000 scenarios), matches or beats Opus 5 on prompt-injection resistance, and attempted to cross containment boundaries about 85% less often than Opus 5.
It is the first Opus model to launch with a Fable 5.1-class set of safeguards: most cybersecurity tasks are transparently re-routed to Opus 4.8, biology work sits behind new safeguards (organizations doing legitimate life-sciences research can apply to the Life Sciences Verification Program for broader access), a "preserved thinking" mechanism guards against model distillation, and outputs carry watermarking for EU AI Act compliance.
Thinking mode cannot be disabled on this model, and it was evaluated pre-release by outside groups including METR and Frontier Design. Opus 5.5 is available on the Claude API plus AWS, Google Cloud, and Microsoft Azure. Treat any specific figure here as a launch-window snapshot and confirm current details against Anthropic's own documentation.
Read this launch narrowly and it's genuinely good news you can act on today: the writing brain got cheaper, quicker, and easier to defend to a compliance team, and nothing else about a content operation moved. Opus 5.5 drafts a superb script, article, or caption and reads a chart on the way in — then it stops. It doesn't render the avatar video, build the carousel, design the quote graphic, or schedule a post. A better, cheaper, safer drafting model makes the words easier; it doesn't touch the media-and-publishing bottleneck. That gap is what Kompozy fills.
The concrete move: Kompozy already generates its Text Posts, Blog Articles, and Email Newsletters with Claude and OpenAI models governed by your Persona Brief and banned-word filters. Then Kompozy does what Opus 5.5 can't: it generates Persona Shorts and Persona HeyGen avatar video with a face-locked identity, Clipped Shorts, brand-exact Carousels via HyperFrames, Photo Posts, Infographics, and Quote Graphics, auto-captions and reframes everything to 9:16, 1:1, and 16:9, and — with Autopilot and a per-post review pipeline — schedules and publishes the batch across Instagram, TikTok, YouTube, LinkedIn, Facebook, X, Pinterest, and Threads plus a blog and Mailchimp. Opus 5.5 upgraded the sentence and dropped its price; Kompozy is still the engine that turns the sentence into a week of on-brand, published content.
An AI avatar video made in Kompozy. A text model cannot render this format by itself.
Best for:
Not ideal for:
Anthropic released Claude Opus 5.5 on September 22, 2026 (API ID claude-opus-5-5). It's the first model in the new 5.5 family and the successor to Opus 5 — a frontier text-and-reasoning model positioned on lower pricing, faster output, stronger performance, and a new class of safeguards rather than a single new capability.
Anthropic prices it at $4 per million input tokens and $20 per million output tokens — about 20% below Opus 5's $5/$25 — with cache reads at $0.20 per million and a higher-priced Fast mode at $8 in / $40 out. The company says the net effect is roughly 40% lower cost on typical workloads. Confirm current pricing on Anthropic's site.
By most accounts, yes — independent benchmarking site Artificial Analysis put it at #1 on its Intelligence Index at launch, and Anthropic's own testing shows it leading Fable 5.1 in agentic coding, computer use, and knowledge work — but Anthropic itself cautioned that benchmark margins overstate real-world differences at this level, and that the practical gap between Opus 5.5 and Fable 5.1 is narrower than the scores suggest.
No. Opus 5.5 is multimodal on the input side — its vision reads charts, documents, and screenshots — but its output is text. It doesn't generate images, synthesize voice, or render video, and it doesn't publish anywhere. Turning its copy into avatar video, carousels, images, and scheduled posts is the job of a content engine like Kompozy.
We checked every figure, date, quote and product claim on this page against the sources listed below on 2026-10-23, and removed or rewrote anything we could not confirm. Prices, benchmarks, quotes and safeguards come from Anthropic's launch page and model docs. The Intelligence Index ranking was read off Artificial Analysis on the date above. Kompozy platform and format details come from kompozy.io.
Sources