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Anthropic releases Claude Fable 5.1 with 1M context window and lower pricing

By PulseAugur Editorial · [1 sources] ·

Anthropic has released its latest model, Claude Fable 5.1, accessible via the HopBase API. This new model boasts a 1 million token context window and a 128,000 token max output, enabling it to process extensive documents and long conversations. Claude Fable 5.1 also features adaptive thinking capabilities, allowing for adjustable reasoning depth and cost control through the `output_config.effort` parameter. The model is optimized for long-horizon agent tasks, offering improved performance in coding, document analysis, research, and vision compared to its predecessor, Fable 5, with a significant reduction in cache read pricing. AI

IMPACT Enhances capabilities for long-horizon agent tasks and reduces operational costs for processing large contexts.

RANK_REASON New model release from a frontier lab (Anthropic) with detailed 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 Fable 5.1 with 1M context window and lower pricing

How we ranked this

Signal score
14 / 100
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Newsworthiness bucket
Significant
New model release from a frontier lab (Anthropic) with detailed system card. [lever_c_demoted from frontier_release: ic=1 ai=1.0]
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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
Clearly on-topic for AI-industry coverage.
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Same-day
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COVERAGE [1]

  1. dev.to — LLM tag TIER_1 English(EN) · hopbase ·

    Claude Fable 5.1 API: 1M Context, $0.25/M Cache Reads and Migrating from Fable 5

    <p>Anthropic's newest flagship, <strong>Claude Fable 5.1</strong> (model ID <code>claude-fable-5-1</code>), is available through the HopBase API over the native Anthropic Messages protocol. If your key already calls Claude, switching is a one-line model-name change; confirm with …

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