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● TRACKER Updated 13d ago · 11 sources tracked

Anthropic’s new Fable release is cheaper, less restrictive

Anthropic has launched Claude Fable 5.1 and Mythos 5.1, positioning them as highly capable systems for scientific research, software development, and enterprise knowledge work. Fable 5.1 is now generally available in GitHub Copilot. The new model features reduced costs, including a 75% cut in cache read prices and savings up to 45% for complex agentic coding tasks. Anthropic states the model is smarter and utilizes more precise safeguards to reduce false positives, resulting in fewer prompt refusals compared to previous versions.

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  • ✓ Claude Fable 5.1 is generally available in GitHub Copilot.
  • ✓ Anthropic released both Claude Fable 5.1 and Mythos 5.1 models.
  • ✓ Cache read prices for the new model are reduced by 75%.
  • ✓ Savings for complex agentic coding tasks reach up to 45%.
🛡️ Source Corroboration: 11 independent reporting domains (100% confidence) ⏱ Read time: ~2 min

What changed

Anthropic introduced Claude Fable 5.1 and Mythos 5.1 with revised cost structures and updated safeguards.

Live updates

  1. Anthropic Releases Claude Fable 5.1 with Lower Costs and Coding Improvements

    Anthropic has launched Claude Fable 5.1 and Mythos 5.1, positioning them as highly capable systems for scientific research, software development, and enterprise knowledge work. Fable 5.1 is now generally available in GitHub Copilot. The new model features reduced costs, including a 75% cut in cache read prices and savings up to 45% for complex agentic coding tasks. Anthropic states the model is smarter and utilizes more precise safeguards to reduce false positives, resulting in fewer prompt refusals compared to previous versions.

    Why it matters

    The release targets long-running problem-solving tasks and advanced coding benchmarks. This move follows a trend of budget-focused AI models, such as Google's Gemini 3.8 Flash, which competes on cost and agentic performance.

    What is confirmed

    • Claude Fable 5.1 is generally available in GitHub Copilot.
    • Anthropic released both Claude Fable 5.1 and Mythos 5.1 models.
    • Cache read prices for the new model are reduced by 75%.
    • Savings for complex agentic coding tasks reach up to 45%.
    • The new models feature updated safeguards designed to produce fewer false positives.

    What to watch next

    • Performance benchmarks comparing Fable 5.1 against Gemini 3.8 Flash in agentic coding
    • Enterprise adoption rates of the Mythos 5.1 model for scientific research
    Sources used for this update (11)
    1. TechCrunch — Anthropic’s new Fable release is cheaper, less restrictive
    2. Bloomberg.com — Anthropic Says New Fable AI Model Is Cheaper, Better at Coding
    3. The GitHub Blog — Claude Fable 5.1 is generally available in GitHub Copilot
    4. The New Stack — Anthropic’s Fable 5.1 is a bit cheaper, a bit smarter, and refuses a lot less
    5. Axios — Anthropic releases new models, cost structures and safeguards
    6. tech.yahoo.com — Anthropic Fable 5.1 AI model is cheaper and better at coding
    7. dailytechnewsshow.com — Google Won’t Have to Sell its Ad Business – DTNS 5345
    8. the-decoder.com — Gemini 3.8 Flash is Google's third budget model in six weeks while frontier models remain MIA
    9. www.theverge.com — Anthropic launches Claude Fable 5.1 and says it’s up to 45 percent cheaper for agentic work
    10. cybersecuritynews.com — Anthropic Launches Claude Fable and Mythos 5.1 for Advanced Coding and Research
    11. www.itpro.com — Anthropic says Claude Fable 5.1 ‘sets a new standard for coding, knowledge work, and long-running problem-solving tasks’
    confidence 100%
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