Fable 5.1 Tops Opus 5 on Terminal-Bench 4.0
On Terminal-Bench 4.0 inside Claude Code, Fable 5.1 scores 55.8%, beating both Fable 5 (42%) and Opus 5 (52.3%). It leads across agentic coding and computer use evals.
ClaudeDevs·Tue 2:13pm ET
Fable 5.1 Launches in Claude Code and API
Fable 5.1 is live in Claude Code and the Claude Platform. Same price as Fable 5, with 75% cheaper cache reads. It handles longer tasks before needing user input, better signals when it's stuck, and writes more naturally.
ClaudeDevs·Tue 2:13pm ET
Fable 5.1 Launch Triggers Reset of Usage Limits
All users get fresh 5-hour and weekly usage limits reset alongside the Fable 5.1 launch today.
ClaudeDevs·Tue 2:35pm ET
Fable 5.1 Ships as Best Model for Coding and Agentic Work
Fable 5.1 leads across coding, data analysis, computer use, design, presentations, and long-running agentic tasks. The Claude Code team calls it a pleasure to work with and describes it as their best model yet.
bcherny·Tue 3:04pm ET
Fable 5.1 Builds Plane-Tracking Mac App in One Session
An Anthropic demo developer used Fable 5.1 to build a Mac app that tracks overhead flights and announces their position out loud, describing the model as one that 'just gets it' without much back-and-forth.
dfeinition·Tue 2:13pm ET
Fable 5.1 Builds Moon Crater Navigation on Real NASA Terrain
A turn-by-turn navigation app for the Moon built on actual NASA terrain data, rendered as a 3D globe with no libraries, routes between craters while steering around the largest ones and explaining each decision.
dfeinition·Tue 2:32pm ET
Fable 5.1 Generates Industrial Robot From Single Prompt
Adocomplete prompted Fable 5.1 to create and animate a realistic industrial robot, inspired by a house-walkthrough demo. The resulting video shows a fully animated 3D robot built end-to-end by the model.
adocomplete·Tue 4:36pm ET
More Stories
User Hits Session Limit After 45 Minutes of Fable 5.1 Coding
A user on a 20x Pro plan hit their 5-hour session limit after roughly 45 minutes of coding across three chats, also consuming 38% of their weekly Fable allocation. A team member asked them to run /feedback in the affected sessions and share the feedback ID.
lydiahallie·Tue 7:24pm ET
User Hits Rate Limits Fast Running Multiple Fable 5.1 Threads
A user running three high-effort and two medium-effort Fable 5.1 threads burned through 12% of their weekly limit and 40% of their 5-hour limit in 18 to 20 minutes. A team member reached out via DM.
lydiahallie·Tue 7:31pm ET
Team Collecting Feedback IDs on Limits Bug
A user reported their limits disappeared in a single prompt, flagging it as likely a bug. A team member asked them to run /feedback in the affected session and share the resulting ID.
lydiahallie·Tue 7:20pm ET
Fable Not Appearing in CLI? Restart Claude
A user reported not seeing Fable 5.1 in the Claude CLI. The fix is a config cache freshness issue; restarting Claude resolves it.
bcherny·Tue 3:25pm ET
Fable 5.1 Builds Full Robot Animation in 115k Tokens
A complete industrial robot, including creation, animation, and rendering, came in at about 115k tokens via a single Fable 5.1 prompt. adocomplete thinks game development is about to get a major boost from this capability.
adocomplete·Tue 4:39pm ET
Fable 5.1 and Mythos 5.1 Now Available
Fable 5.1 and Mythos 5.1 are out. Key improvements: the model goes deeper into tasks before asking for help, admits when it is stuck rather than faking progress, and fixes root causes instead of reaching for quick patches. Cache reads are 75% cheaper; base price unchanged.
adocomplete·Tue 2:11pm ET
Fable 5.1 Cache Reads Drop to $0.25 Per Million Tokens
Cache read pricing for Fable 5.1 falls from $1 to $0.25 per million tokens for Enterprise, API, and SDK customers. A typical Claude Code session works out roughly 38% cheaper as a result.
bcherny·Tue 3:04pm ET
Biology Safeguards Trigger 85% Less Often in Fable 5.1
The latest biology safeguards intervene on benign requests 85% less often than those shipped with Fable 5. Claude Code users can expect around 60% fewer cyber interventions per session, with further improvements on the way.
bcherny·Tue 3:04pm ET