Fast-mode variant of [Opus 5](/anthropic/claude-opus-5) - identical capabilities with higher output speed at 2x pricing relative to regular Opus 5. Learn more in Anthropic's docs: https://platform.claude.com/docs/en/build-with-claude/fast-mode
With CoreAI, you can start chatting with Claude Opus 5 (Fast) instantly — no separate subscription needed. CoreAI lets you chat with Claude Opus 5 (Fast) alongside 300+ other AI models from Anthropic and other providers like OpenAI, Anthropic, Google, Meta, and more.
Measured against all 328 chat models CoreAI serves, Claude Opus 5 (Fast) sits at #47 for context capacity — 1M tokens, roughly 750,000 words or 1,500 pages of text in a single conversation. On price, it is the #33 cheapest of 50 premium-tier models by input cost. Released 2026-07-24, it is one of the 1 newest additions to the catalog. It supports step-by-step reasoning (thinking mode) and accepts image input.
Every model in this table is available on CoreAI — open the web app and run the same prompt through Claude Opus 5 (Fast) and Anthropic: Claude Fable 5 side by side to judge with your own eyes.
A typical question (about 1,000 tokens in, 500 out) runs $0.0350 on Claude Opus 5 (Fast)'s raw per-token rates; a heavy session with a 50K-token document costs about $0.750. On CoreAI you don't juggle these numbers — one subscription covers Claude Opus 5 (Fast) and 300+ other models under a plan usage limit, with no API keys. See plans.
Claude Opus 5 (Fast) handles 1M tokens of context — roughly 750,000 words, or about 1,500 pages of text in one conversation.
Claude Opus 5 (Fast)'s underlying rates are $10 per 1M input tokens and $50 per 1M output tokens. On CoreAI it is included in one subscription alongside 300+ models, so there is no per-token billing to manage.
Yes — Claude Opus 5 (Fast) accepts image input, so you can attach screenshots, photos or diagrams and ask questions about them.
Yes. Claude Opus 5 (Fast) can work through problems step by step before answering; on CoreAI you can toggle thinking mode per message.
Open the CoreAI web app or the iOS/Android app, pick Claude Opus 5 (Fast) in the model selector, and chat — no API key, no per-token billing. One subscription covers Claude Opus 5 (Fast) and 300+ other models.
The closest alternatives on CoreAI are Anthropic: Claude Fable 5, Sakana: Fugu Ultra, inclusionAI: Ling-2.6-flash — similar tier and capability. The fastest way to choose is running one prompt through them side by side in CoreAI's Compare view.
Chat with Claude Opus 5 (Fast) and 300+ other AI models — all in one app.