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Anthropic's Fable 5 reroutes coding to Opus 4.8 amid safety upgrades

By PulseAugur Editorial · [9 sources] ·

Anthropic has redeployed Claude Fable 5 globally after a three-week hiatus, implementing a new safety classifier that automatically reroutes certain cybersecurity-related tasks to the less capable Opus 4.8 model. This change, while intended to enhance security, has led to increased false positives for routine coding and debugging tasks, frustrating some users who perceive it as a downgrade or a "bait-and-switch." Anthropic is also collaborating with major tech partners and the US government to develop a framework for assessing and responding to AI jailbreaks. AI

IMPACT This shift may lead to more false positives for developers, potentially impacting workflows and increasing reliance on less capable models for certain tasks.

RANK_REASON Frontier-lab model release with system card and new behavior.

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AI-generated summary · Google Gemini · from 9 sources. How we write summaries →

Anthropic's Fable 5 reroutes coding to Opus 4.8 amid safety upgrades

COVERAGE [9]

  1. HN — anthropic stories TIER_1 English(EN) · babelfish ·

    Fable 5 will default to Opus 4.8 for coding tasks

  2. Mastodon — sigmoid.social TIER_1 English(EN) · [email protected] ·

    Is it only me or Opus 4.8 has become dumber since Anthropic gave back access to Fable? If it's not just my impression that marks an egregious bait-and-switch. F

    Is it only me or Opus 4.8 has become dumber since Anthropic gave back access to Fable? If it's not just my impression that marks an egregious bait-and-switch. Frontier models are ready to start milking the cow, by increasing effective subscription prices immensely. You heard the …

  3. Towards AI TIER_1 English(EN) · Yashraj Behera ·

    Claude Fable 5 Is Back, and It Now Reroutes Some of Your Requests to Opus 4.8 Automatically

    <p><em>After roughly three weeks offline, Claude Fable 5 is available again as of July 1, and the version that returned isn’t quite the one that left. The most interesting change is a new automatic delegation system, when the model detects a request that trips its safety classifi…

  4. r/Anthropic TIER_1 English(EN) · /u/ynm_1998 ·

    Since they've released Fable 5, Opus 4.8 is now a total joke. This is absolutely absurd.

    <!-- SC_OFF --><div class="md"><p>This thing has gone absolutely crazy.</p> <p>How come these people don't care about their users at all? They make other models useless deliberately. Being a paying user for $200 a month just gets you something that's utterly untrustworthy.</p> </…

  5. r/Anthropic TIER_1 English(EN) · /u/Vegetable_Quit_4896 ·

    What to do when Fable switches to OPUS 4.8?

    <!-- SC_OFF --><div class="md"><p>What to do when Fable switches to OPUS 4.8?<br /> anyone has some good advice?<br /> I'm just trying to create tools to make managing and troubleshooting more easy for myself in IT... but then Fable switches to OPUS 4.8... but ofcourse i wanna ta…

  6. r/Anthropic TIER_1 English(EN) · /u/mynoliebear ·

    Fable triggers Opus on everything

    <!-- SC_OFF --><div class="md"><p>New system, no memories. Asked Fable to debug something based on a log file. Triggered itself. I asked it what caused the trigger, triggered itself. I legitimately cannot get it to do any work without it triggering itself. This is insane. I’m sur…

  7. r/cursor TIER_2 English(EN) · /u/Just_Run2412 ·

    How do we know when Fable 5 falls back to Opus?

    <!-- SC_OFF --><div class="md"><p><a href="https://forum.cursor.com/u/g4q4"></a>Is there any indication within Cursor when Fable 5 falls back to Opus 4.8?</p> <p>On some of my runs, I suspect it’s falling back to Opus, but there’s literally no indication. Can someone from the tea…

  8. r/ClaudeAI TIER_2 English(EN) · /u/HopefulRazzmatazz451 ·

    To everyone complaining about wasting their credits with opus 4.8 instead of fable

    <!-- SC_OFF --><div class="md"><p>You know there’s a setting where you can make it so that it stops generating instead of automatically switching. </p> </div><!-- SC_ON --> &#32; submitted by &#32; <a href="https://www.reddit.com/user/HopefulRazzmatazz451"> /u/HopefulRazzmatazz45…

  9. r/singularity TIER_2 English(EN) · /u/Mr_Hyper_Focus ·

    Fable 5 will divert coding to Opus 4.8 according to Anthropic

    <table> <tr><td> <a href="https://www.reddit.com/r/singularity/comments/1ukbtjm/fable_5_will_divert_coding_to_opus_48_according/"> <img alt="Fable 5 will divert coding to Opus 4.8 according to Anthropic" src="https://preview.redd.it/b200anypsjah1.jpeg?width=640&amp;crop=smart&amp…

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