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Anthropic releases Claude Opus 5.5 fast mode at double the price

By PulseAugur Editorial · [1 sources] ·

Anthropic has officially released the fast mode for its Claude Opus 5.5 model, removing the previous preview access requirements. This new mode offers up to 2.5 times higher output tokens per second but comes at double the cost of the standard Opus 5.5 model. The speed enhancement primarily benefits output token generation, not the time to the first token, and switching between fast and standard modes can invalidate the prompt cache, potentially increasing costs for certain workflows. AI

IMPACT Accelerates inference for specific workloads, but at a higher cost and with potential cache invalidation issues.

RANK_REASON Frontier-lab model release with system card. [lever_c_demoted from frontier_release: ic=1 ai=1.0]

Read on dev.to — LLM tag →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

Anthropic releases Claude Opus 5.5 fast mode at double the price

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51 / 100
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Significant
Frontier-lab model release with system card. [lever_c_demoted from frontier_release: ic=1 ai=1.0]
Source corroboration
Single-source cluster
Only one publisher covered this so far. Single-source stories can still rank when the publisher is high-authority, but they lack cross-source corroboration.
Topics
model release, product
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High
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Breaking (< 6h)
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Full methodology in our editorial standards.

COVERAGE [1]

  1. 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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