“Cognition announced that GPT-6 Astra is coming to Devin, claiming it performs within 0.4 points of Fable 5 on FrontierCode 1.1 at a 64% lower cost.”

Cognition announced that GPT-6 Astra is coming to Devin, claiming it performs within 0.4 points of Fable 5 on FrontierCode 1.1 at a 64% lower cost. Cognition also says Astra sets a new state of the art on its internal testing benchmark, producing more comprehensive tests, clearer reports, and better video evidence.

“Garry Tan compared using GStack before and after Fable 5, saying that for many one-way-door questions returned in Claude Code, users can simply choose “Take all recommendations” and be happy.”

#18 𝕏 Garry Tan compared using GStack before and after Fable 5, saying that for many one-way-door questions returned in Claude Code, users can simply choose “Take all recommendations” and be happy.

“Claude will include Fable 5 in all Max and Team Premium plans at 50% of normal limits starting July 20. Pro and Team Standard users keep access via usage credits (with a one-time $100 credit), with the staged rollout helping manage unpredictable demand.”

#1 𝕏 Claude will include Fable 5 in all Max and Team Premium plans at 50% of normal limits starting July 20. Pro and Team Standard users keep access via usage credits (with a one-time $100 credit), with the staged rollout helping manage unpredictable demand. Also covered by: @Simon Willison

“Cognition incorporates Fable 5 into Devin Fusion, finding it achieves lower per-task costs than Opus 4.8 and boosts efficiency in delegation and reasoning chains.”

#12 𝕏 Cognition incorporates Fable 5 into Devin Fusion, finding it achieves lower per-task costs than Opus 4.8 and boosts efficiency in delegation and reasoning chains. #24 𝕏 Cognition found that Fable acts like a competent manager—writing comprehensive specs, giving detailed feedback, and trusting its sidekick with execution—whereas Opus 4.8 micromanages by redoing work, rereading referenced files, and overloading its context window.

“Claude Code Blog A field guide to Claude Fable 5: Finding your unknowns - Introduces Claude Fable 5 and provides guidance for identifying and addressing unknowns when building with the model.”

GenAI PM Daily July 07, 2026 GenAI PM Daily 🎧 Listen to this brief 3 min listen Today's top 20 insights for PM Builders, ranked by relevance from Blogs, YouTube, and LinkedIn. #12 📝 Claude Code Blog A field guide to Claude Fable 5: Finding your unknowns - Introduces Claude Fable 5 and provides guidance for identifying and addressing unknowns when building with the model. The article targets developers and teams using Claude Code, offering practical tips and use cases for working with Fable 5. Also covered by: @Santiago , @Thariq , @Udi Menkes , @Mario Zechner

“A 1-minute Spotify launch video was generated end-to-end by prompting Cloud Code with Fable 5 using the “/website-to-video” HyperFrames skill on spotify.com (“make a launch video for spotify.com”).”

#6 ▶️ Full Tutorial: Make Professional Launch Videos for Free with Hyperframes | Bin Liu & Jake Moran Peter Yang Use HeyGen’s open-source HyperFrames framework with AI coding agents (e.g., Cloud Code + Fable 5) to convert any website URL (such as spotify.com) into a professional launch video by generating an HTML/CSS/JavaScript codebase and rendering it to MP4 for free. A 1-minute Spotify launch video was generated end-to-end by prompting Cloud Code with Fable 5 using the “/website-to-video” HyperFrames skill on spotify.com (“make a launch video for spotify.com”). HyperFrames installs via the quickstart script at hyperframes.ai.com/quickstart, as the “HyperFrames by HeyGen” plugin in the Codex Plugin Store (Creativity section), or as a connector in Claude, enabling slash-command video generation.

“The US Department of Commerce banned Anthropic’s safety-enhanced model Fable 5 (and its full-capacity sibling Mythos 5) three days after Fable’s release, forcing Anthropic to pull both models and revert users to Opus 4.8 due to a public jailbreak.”

#4 ▶️ One man just liberated Fable... and now it’s illegal Fireship The US Department of Commerce banned Anthropic’s safety-enhanced model Fable 5 (and its full-capacity sibling Mythos 5) three days after Fable’s release, forcing Anthropic to pull both models and revert users to Opus 4.8 due to a public jailbreak.

“Anthropic has been ordered by the US government to suspend all foreign-national access to Fable 5 and Mythos 5, so both models are now disabled for all customers.”

Anthropic has been ordered by the US government to suspend all foreign-national access to Fable 5 and Mythos 5, so both models are now disabled for all customers. Access to other Claude models remains unaffected, and they’re working to restore service as soon as possible. Also covered by: @Armin Ronacher

“Fable 5 uses the same underlying model as Mythos 5 but adds classifier models that intercept queries about cybersecurity, biology, chemistry, or model distillation and reroute them to Claude Opus 4.8.”

#14 ▶️ Anthropic begged the world to stop AI… then shipped this Fireship Using Anthropic’s Mythos-class model Claude Fable in max effort mode to generate a high-fidelity Horse Tinder app UI with vector SVG graphics, swipe animations, and custom UI touches in about 20 minutes. Claude Fable is priced at $50 per million output tokens (vs. $25 for Claude Opus 4.8) and is free for paid Claude plan users until June 22, 2026, after which it’s available only on a per-token basis. Fable 5 uses the same underlying model as Mythos 5 but adds classifier models that intercept queries about cybersecurity, biology, chemistry, or model distillation and reroute them to Claude Opus 4.8. In the demo, Claude Fable produced a Horse Tinder UI—including a realistic SVG horse icon, Tinder-style drag animation, “yay”/“nay” buttons, and a “strictly confidential” label—in approximately 20 minutes.

“#9 ▶️ You are using Claude Fable 5 wrong Greg Isenberg An Anthropic employee leveraged Fable 5 to transcribe 17 takes of four video scenes using 11 Labs and Whisper, auto-select best shots via sub-agents into a JSON-driven FFmpeg workflows/gold pipeline, stitch clips, render static frames with Remotion, and apply professional color grading.”

#9 ▶️ You are using Claude Fable 5 wrong Greg Isenberg An Anthropic employee leveraged Fable 5 to transcribe 17 takes of four video scenes using 11 Labs and Whisper, auto-select best shots via sub-agents into a JSON-driven FFmpeg workflows/gold pipeline, stitch clips, render static frames with Remotion, and apply professional color grading. Processed 17 takes across four scenes with 11 Labs transcription service and Whisper flow, removed filler “ums,” and used sub-agents to pick the best shots. Created a JSON edit file to orchestrate clip stitching and color grading via FFmpeg commands within a workflows/gold setup, then exported static design frames as code using Remotion. Delivered a fully color-graded launch video—production value that once cost hundreds of thousands of dollars—entirely within Fable 5.