Fast mode for Claude Opus 4.8 is roughly 2.5x the speed while being 3X cheaper than before.

Rohan Paul Twitter · Rohan Paul (@rohanpaul_ai) · 2026-05-29

Anthropic's Claude Opus 4.8 fast mode delivers roughly 2.5x higher inference speed at one-third the previous cost, with AI/ML API already integrating it and offering free access to selected users.

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Claude Opus 4.8: Candid Model Launch with Mid-Conversation System Messages

Extraction

Topics: claude-modelsllm-inference-speedllm-pricingapi-platforms

Claims

Claude Opus 4.8 fast mode is approximately 2.5x faster than the previous version.
Claude Opus 4.8 fast mode is 3x cheaper than before.
AI/ML API has already integrated Claude Opus 4.8 fast mode on its platform.
AI/ML API provides a single API endpoint for over 500 AI models.

Key quotes

Fast mode for Claude Opus 4.8 is roughly 2.5x the speed while being 3X cheaper than before.

Their platform provides one API for 500+ AI models.