# Anthropic Prices Claude Opus 5.5 at $4 and $20 per Million Tokens, Below Its Own Prior Flagship

The company says the model matches Claude Fable 5.1 on most work while running 40 percent cheaper than Opus 5 and generating output more than 30 percent faster.

- Published: 2026-09-25T13:31:21.671Z
- Canonical: https://polylog.news/ai/2026-09-25/anthropic-prices-claude-opus-5-5-at-4-and-20-per-million-tok
- Publisher: Polylog (AI desk)
- Section: tech
- Sources: [Anthropic](https://www.anthropic.com/claude-opus-5-5), [VentureBeat](https://venturebeat.com/technology/anthropic-releases-claude-opus-5-5-beating-fable-5-1-on-key-agentic-benchmarks-at-60-cheaper-api-price), [The Decoder](https://the-decoder.com/claude-opus-5-5-matches-fable-5-1-at-40-percent-lower-cost-as-anthropic-promises-to-fix-claudish-writing/)

Anthropic's [Claude Opus 5.5](https://www.anthropic.com/claude-opus-5-5) is priced at $4 per million input tokens and $20 per million output tokens, down from $5 and $25 for Opus 5, with cache-read costs cut by 60 percent. The company says the model matches Claude Fable 5.1's performance on most work at 40 percent lower running cost than Opus 5, and produces output more than 30 percent faster, [as reported by The Decoder](https://the-decoder.com/claude-opus-5-5-matches-fable-5-1-at-40-percent-lower-cost-as-anthropic-promises-to-fix-claudish-writing/).

The capability claims are Anthropic's own. The company reports leads on agentic coding, computer use and knowledge work on its internal evaluation suite, and [VentureBeat's coverage](https://venturebeat.com/technology/anthropic-releases-claude-opus-5-5-beating-fable-5-1-on-key-agentic-benchmarks-at-60-cheaper-api-price) frames the API price as 60 percent below Fable 5.1 on key agentic tests. Neither the 40 percent running-cost figure nor the agentic performance claims have been reproduced by an independent evaluator yet, and the two cost percentages describe different comparisons: one against Opus 5, the other against Fable 5.1.

Two engineering details matter alongside the pricing. Anthropic says Opus 5.5 is less likely to take hard-to-reverse actions and more resistant to prompt injection than Opus 5, which matters more to agent operators than headline benchmark scores. The model is available directly through Anthropic and on Amazon Web Services, Google Cloud and Microsoft Azure, so switching costs are low for teams already using one of those clouds.

## What this means

The mechanism is cost per completed task rather than cost per token. A cheaper, faster model at equal quality increases the number of agent steps a customer can afford per workflow, which increases total token volume even as unit prices fall. Anthropic is exposed on gross margin if the efficiency gain proves smaller than claimed, and OpenAI and Google are exposed on their highest-priced tiers, since a rival's flagship model now undercuts its own predecessor by 20 percent on posted rates. Each of the last several frontier releases across labs has launched at a lower posted price than the model it replaced, so this move continues that pattern rather than breaking from it. Over the coming weeks, a competitor is likely to match this pricing or introduce a cheaper high-end tier, conditional on Anthropic's serving economics holding up under agentic load. That reading would be wrong if independent agentic evaluations place Opus 5.5 materially below Fable 5.1 on long-horizon coding, which would mean the price cut is really a downgrade sold as a discount.

## What to watch

- Independent reproductions of the agentic coding and computer-use claims by third-party evaluators. These will determine whether the claimed performance parity holds up under outside testing.
- Whether OpenAI or Google respond with posted price cuts on their highest-priced tiers rather than with a new capability tier.
- Prompt-injection resistance results from outside red teams. That claim, more than the benchmark scores, is what agent operators are actually paying for.