Fable
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Stories
Filter storiesGergely Orosz said Claude downgraded benign Fable requests to Opus and capped output after classifying the work as risky. He traced one [bio] flag to a Google Sheet collecting public social-post replies.
Anthropic says Claude Fable 5.1 is available across Claude and coding platforms for long-running agent work. It reports 52.6% on Terminal-Bench-Science and API cache-read pricing of $0.25 per million tokens.
Together reports GLM-5.3 solved 87.6% of DeepSWE after four attempts for about $16, versus Fable 5 at 69.7% for $21.63. It estimates equal $100 budgets yield roughly 17 solved tasks for GLM-5.3 and three for Fable 5.
Epoch said an AI-generated solution found a presentation for the absolute Galois group of the 2-adic numbers, marking the second FrontierMath open problem it says AI solved. The result was elicited with Fable 5 and also GPT-5.5 Pro, making it a benchmark milestone rather than a product release.
A U.S. tech adviser accused Moonshot AI of using Anthropic’s Fable to build Kimi K3, while China’s embassy denied related claims. Engineers questioned whether leaderboard results and missing logits fit a simple distillation story.
OpenCode users reported complex DeepSeek V4 API prompts returning Fable-like outputs and CoT style, while simpler prompts did not. The evidence is community-led and disputed, so the claim remains unverified.
Posts citing Anthropic say Fable 5 will stay in Claude Max and Team Premium at 50% of limits. Pro and Team Standard move to credit access with a one-time $100 credit after July 20.
Starting July 20, Fable 5 is included in Claude Max and Team Premium at 50% of plan limits. Pro and Team Standard shift to credit-based access with a one-time $100 credit.
Anthropic said it resolved an issue that made Fable 5 unavailable in claude.ai and Claude Code after users reported lost access or credit prompts. ClaudeDevs said affected extra-usage customers would receive refunds plus matching credits.
Cognition said Devin Fusion now uses Fable 5 and saw lower cost per task than Opus 4.8. Practitioners cited Fable-led delegation patterns that cut token use, with caveats on serial debugging.
Anthropic extended Fable 5 on paid plans and raised Claude Code weekly limits by 50% through July 19 while keeping the half-week cap. Users still described the rolling access changes as disruptive.
Fable-assisted JLens logs and a separate experiment tested how the proposed J-space forms and whether attention gradients into past tokens can be blocked. The reported blocking method worked in the setup but hurt performance, making it a research update rather than an engineering control.
Anthropic says paid Claude plans keep Fable 5 access until July 12, with Fable use capped at 50% of weekly limits. Users still reported exhausted quotas and multiple Max subscriptions as workarounds.
ClaudeDevs reports Sonnet 5 with a Fable 5 advisor reached ~92% of Fable 5's SWE-bench Pro score at ~63% of the price. Other builders route implementation to Sonnet, Codex, GPT-5.5, or GLM workers.
A Fable maintainer set the Claude subscription cutoff for 11:59:59pm PT on July 7 as users posted high Claude Code credit usage. One estimate claimed about $2,267 of usage across two $200 accounts in six days.
Practitioners reported concrete Fable 5 coding outcomes, including sqlite-utils 4.0rc2 for $149.25 and hallucinations in X API and OAuth checks. Failures around tests, finance, production outages, and token-heavy loops kept review systems central.
Fable 5 users said Claude Max subscription access runs through July 7, with some reporting it may return only when compute is available. The deadline changed planning for Fable-heavy coding runs and fallback options.
CAIS and Scale’s Remote Labor Index reportedly put Fable 5 at 16.1% human-accepted freelance tasks, versus 8.3% for Opus 4.8 and 6.3% for GPT-5.5. The same report says AI judges overrated newer models, especially GPT-5.5 and Opus 4.8.
Fable users reported cost escalations from $300/day estimates to a single high-effort prompt above $130 and quota-drain complaints on Reddit. Users also reported automatic Opus fallback and safety refusals tied to bio/cyber safeguards.
Fable 5 users reported Opus 4.8 fallbacks, $600 Max-account rotations, slow browser automation, and token-saving subagents. Watch routing opacity, quota burn, and latency before relying on it for long-running agent work.