Anthropic's new Opus 5.5 matches its largest model at a lower price
Released Sep 22, Claude Opus 5.5 performs at the level of Fable 5.1 on most work, runs more than 30% faster than Opus 5 and costs $4 per million input tokens. It is now the default model in the Claude app, Cowork and Claude Code on paid plans.
What happened
Anthropic released Claude Opus 5.5 on Sep 22, the first model in a new 5.5 family and two months after Opus 5 shipped on Jul 24. The company says it performs at the level of Fable 5.1, its larger and more expensive model, on most tasks, costs about 40% less than Opus 5 on typical workloads and writes output more than 30% faster. The list price fell to $4 per million input tokens and $20 per million output, from $5 and $25, and cached input dropped 60% to $0.20. It is available in the Claude apps on Pro, Max, Team and Enterprise plans and through the API on Anthropic's own platform, AWS, Google Cloud and Microsoft Azure. Anthropic says Sonnet 5.5 and Haiku 5.5 will follow in the coming weeks.
On the results Anthropic published, Opus 5.5 beats Fable 5.1 on every benchmark it lists, including agentic coding (66.4% on Terminal-Bench 4.0, against 55.8%), computer use (81.8% on OSWorld 2.0) and a business-workflow test, AutomationBench, where it scored 40.0% against Opus 5's 26.9%. Early customers describe the same work in fewer steps: one analytics firm said a coding task that had taken 38 prompts over four days took 11 prompts over three hours. Inside Claude, Opus 5.5 is now the default in the app, Cowork and Claude Code for Pro, Max and Team plans at a medium effort setting. Five-hour usage limits in Claude Code rose 20%, and paid users got a one-time limit reset to use whenever they choose.
Before
The best results came from Fable 5.1, the biggest and most expensive model. Opus 5 was the cheaper everyday choice, and it felt a step behind.
Now
The everyday model does Fable-level work on most tasks at $4 and $20 per million tokens, and it is what paid Claude users get by default.
Who it touches
- Owners already paying for Claude Pro or Team, who get the new model by default and about a quarter more use out of the same plan.
- Anyone who pays for the Claude API, where the same job now costs less, about 40% less on typical workloads by Anthropic's figures.
- Offices that hand Claude long jobs such as reports, spreadsheets and document review, where the business-workflow score rose from 26.9% to 40.0%.
- Teams choosing between Claude and OpenAI this month, since both companies shipped on the same afternoon.
What it means for the business
Most of our delivery runs on Claude, so this is a direct change to the cost and speed of every build: the model we default to got better and cheaper at once. For the owners we work with, the change is simpler than the benchmark table. The model inside the plan they already pay for improved overnight, with no setting to change.
The guide Anthropic published alongside it is worth passing on word for word. Give the whole task in one message, name the finish line, and leave it alone. It is the same thing we tell owners about handing work to a new hire, and it is the habit that decides whether a better model produces better work.

On the Stacked Podcast · Sep 23
"This thing doesn't have the ability to output a video, but it can code an entire video from scratch."
The hosts argued that the notable skill in the first demos is not picture quality but that each animation is written entirely as code, so it can be edited like any other file. They expect the same resistance from animators and designers that consultants meet inside companies, and suggested most everyday work does not need the most expensive model.
Watch at 3:40 ↗Fact check: The hosts call OpenAI's new model "Soul" throughout; it is GPT-6 Sol. Their prices, $4 and $20 per million tokens for Opus 5.5 and $2 and $10 for Sol, match both companies' published rates.