Anthropic: Claude Opus 4.8 (Fast)
Analysis Summary
Claude Opus 4.8 Fast is an Anthropic variant listing with text, image, and file input, tool use, function calling, and a one-million-token context window. The supplied record includes no benchmark results for this specific variant, so its reasoning, coding, and agentic reliability cannot be established from the available evidence. The “Fast” label is not accompanied by a speed measurement here.
Its listed capabilities make it a possible candidate for long-document work and multimodal workflows that need tool integration. However, teams should not assume that benchmark results for another Opus variant apply to this one. Validate its output quality, speed, and tool behavior directly before putting it on a client workflow.
Listed input and output prices are high. Until the variant demonstrates a measurable advantage in quality or latency, reserve it for controlled evaluation rather than routine high-volume work.
Assessed September 23, 2026
Editorial notes
Claude Opus 4.8 Fast lists vision, file input, tool use, and a one-million-token context, but this variant has no benchmark results of its own and carries premium listed pricing.
Rankings consider pricing, capabilities, benchmarks, and real-world applicability and are refreshed as new models launch. Feedback?
DFO Verdict
Claude Opus 4.8 Fast lists vision, file input, tool use, and a one-million-token context, but this variant has no benchmark results of its own and carries premium listed pricing.
How Anthropic: Claude Opus 4.8 (Fast) compares
Its 1M-token context window is larger than 82% of the models we list. At $10.00 per million input tokens it is cheaper than 4% of comparable models.
Dark bar = input · light bar = output, scaled to the priciest peer.
1M tokens ≈ 8 full-length novels or ~2,500 pages of business documents in a single request.
Strongest on content. The pulled-in technical corner is the trade-off, and if the shape matters more than the price, this is your model.
Compare shapes side-by-side →Pricing
| Token Type | Cost per 1M tokens | Cost per 1K tokens |
|---|---|---|
| Input | $10.00 | $0.010000 |
| Output | $50.00 | $0.050000 |
What would Anthropic: Claude Opus 4.8 (Fast) cost your business?
Pick the job that looks most like yours, then fine-tune with the sliders. Estimates update live.
A website chatbot handling around 100 customer conversations a day, a few short messages each.
Full calculator with 804 models → Price Calculator
These numbers get smaller with the right architecture.
We route routine calls to cheap models and save Anthropic: Claude Opus 4.8 (Fast) for the hard ones. Most clients cut their estimate by 60-80%.
Talk to our teamAbout Anthropic: Claude Opus 4.8 (Fast)
Fast-mode variant of Opus 4.8 - identical capabilities with higher output speed at 2x pricing relative to regular Opus 4.8. Learn more in Anthropic's docs: https://platform.claude.com/docs/en/build-with-claude/fast-mode
Frequently asked questions about Anthropic: Claude Opus 4.8 (Fast)
How much does Anthropic: Claude Opus 4.8 (Fast) cost?
Anthropic: Claude Opus 4.8 (Fast) costs $10.00 per million input tokens and $50.00 per million output tokens.
What is the context window of Anthropic: Claude Opus 4.8 (Fast)?
Anthropic: Claude Opus 4.8 (Fast) has a context window of 1,000,000 tokens (1M).
What can Anthropic: Claude Opus 4.8 (Fast) do?
Anthropic: Claude Opus 4.8 (Fast) supports image/vision input, tool use, and function calling.
Who created Anthropic: Claude Opus 4.8 (Fast)?
Anthropic: Claude Opus 4.8 (Fast) is developed by Anthropic and was released on May 27, 2026.