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Anthropic's Opus 5.5 Fast Mode leaves preview, doubles price for speed

By PulseAugur Editorial · [2 sources] ·

Anthropic has officially released "Fast Mode" for its Opus 5.5 model, moving it out of research preview. This feature doubles the cost per token, with input tokens priced at $8 per million and output tokens at $40 per million, while promising up to 2.5 times faster output token generation. However, the speed benefits are primarily focused on output tokens per second and do not significantly reduce the time to the first token. A critical consideration is that switching between fast and standard modes invalidates the prompt cache, potentially leading to higher costs for subsequent requests. AI

IMPACT This release offers users faster output generation at a premium price, potentially impacting cost-benefit analyses for real-time AI applications.

RANK_REASON General availability release of a specific model version with a new feature (Fast Mode) from a frontier lab. [lever_c_demoted from frontier_release: ic=2 ai=1.0]

Read on Medium — Claude tag →

AI-generated summary · Google Gemini · from 2 sources. How we write summaries →

Anthropic's Opus 5.5 Fast Mode leaves preview, doubles price for speed

How we ranked this

Signal score
0 / 100
Composite score across the factors below. Higher = stronger signal that this story matters right now.
Newsworthiness bucket
Significant
General availability release of a specific model version with a new feature (Fast Mode) from a frontier lab. [lever_c_demoted from frontier_release: ic=2 ai=1.0]
Source corroboration
2 independent sources
Multiple independent publishers reporting the same story raises confidence that it's real and newsworthy.
Topics
model release, product
Editorial topic classification. Feeds into how the story surfaces on /topic/<slug> hub pages and into the per-entity coverage mix.
AI-industry relevance
High
Clearly on-topic for AI-industry coverage.
Story freshness
29 days old
Aged out of breaking-news scoring windows; ranking reflects the durable signal from the full source set.

Full methodology in our editorial standards.

COVERAGE [2]

  1. Medium — Claude tag TIER_1 English(EN) · Automation Labs ·

    Opus 5.5 Fast Mode Went GA Oct 15: 2x the Price for 2.5x Speed

    <div class="medium-feed-item"><p class="medium-feed-image"><a href="https://medium.com/@automation.labs/opus-5-5-fast-mode-went-ga-oct-15-2x-the-price-for-2-5x-speed-f8a8f3b85095?source=rss------claude-5"><img src="https://cdn-images-1.medium.com/max/2600/0*GwTscekX9pXvcdNg" widt…

  2. dev.to — LLM tag TIER_1 English(EN) · Gabriel Anhaia ·

    Opus 5.5 Fast Mode Leaves Preview: 2x the Price, and a Speed Switch Misses the Cache

    <ul> <li> <strong>Book:</strong> <a href="https://www.amazon.com/dp/B0GYMFPTWV" rel="noopener noreferrer">System Design Pocket Guide: Fundamentals</a> </li> <li> <strong>The series:</strong> <em>Pocket Guides for Developers</em> — 8 short books on agents, RAG, prompts, observabil…

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