Claude Fable 5.1 in Claude Code 2.1.280
skills off
The connection upstream of the harness dropped the run before any output. Not a model failure.
Wall time 5m 16sCost $0.020 reported
Review
Not the model's fault and not a harness-config failure: with the watchdog at 30 minutes and the fallback off, the stream was cut upstream after about 5 minutes of silent thinking ("API Error: Stream ended without receiving any events").
The full review
Not the model's fault and not a harness-config failure: with the watchdog at 30 minutes and the fallback off, the stream was cut upstream after about 5 minutes of silent thinking ("API Error: Stream ended without receiving any events"). Logged as an infrastructure DNF (upstream silence drop).
Verdict by reviewer.
Infrastructure DNF. Infrastructure: with the CC watchdog at 30 min and fallback off, the stream was still cut upstream after ~5 min of silence ("Stream ended without receiving any events"). Not a model failure.
Attempt 2 of 4
Every try of this model in this harness on this prompt, oldest first. A later attempt is the cell's result: attempt 4.
Scores
Not scored: only runs that finished on their own are scored.
Downloads
Files actually published for this run. Original output, site-made previews and post-run conversions are labelled separately.
The exact prompt
agentic harness (save the file; self-render allowed), 2,074 characters. Every result for this prompt
Create a single self-contained SVG illustration of the Sony PS5 Pro DualSense wireless controller at MAXIMUM fidelity. This is a showcase piece: take your time to plan the geometry carefully before writing it. Requirements: 1) Accurate DualSense silhouette and proportions: a wide body with the large, wide touchpad spanning the top centre, two flared, rounded grips sweeping down and outward, and a perfectly symmetrical left/right layout. White outer shell with the black central core section. 2) Face buttons on the right in the classic diamond: triangle (top), circle (right), cross (bottom), square (left), each drawn as clean PlayStation symbols in their real colours (green triangle, red circle, blue cross, pink square) in the modern outline style on light buttons, with subtle bevels. 3) D-pad on the left as FOUR separate arrow-shaped directional buttons (up, down, left, right), not a single cross. 4) Two black analog sticks with concave tops and a textured grip ring (fine radial or dotted texture) and shading. 5) The PlayStation logo button centred below the touchpad between the sticks, the small mic mute button with its orange-tinted indicator line just below it, the Create button (left) and Options button (right) flanking the touchpad. 6) The blue light-bar glow running along both side edges of the touchpad, with a soft bloom. Speaker grille holes on the black core. 7) Realistic product-render shading: gradients, specular highlights, soft ambient occlusion, a contact shadow beneath the controller. 8) A clean dark studio background with a subtle radial vignette. Front-on hero shot, centred and filling the frame well. Use viewBox="0 0 1600 1100" with width="1600" height="1100". No external assets, no raster images, no fonts, no scripts. Output ONLY the complete SVG code, starting with <svg and ending with </svg>, with no explanation or markdown fences. Save it as controller.svg in the current directory. You may render and inspect your own output (headless chromium is available at /usr/bin/chromium) and iterate on your own before finishing.
How it was made
Step by step
The prompt, every agent turn and tool call (tool name and a one-line summary; inputs and outputs are not shown), then the final message. The full machine-format transcript is published as a scrubbed download.
Show all 2 steps
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Download the full transcript Claude Code session JSONL, 43 KB. Scrubbed: anything that looks like a key, token, e-mail address or phone number is replaced, and account details and the test machine's file paths are removed.
Cost breakdown
Headline cost $0.020, as reported by Claude Code (its own bill for the run). The list-price estimate from the token counts is $0.020.
| Tokens by type | Tokens | $ per 1M | Cost |
|---|---|---|---|
| Input (uncached) | 1,900 | $10.00 | $0.0190 |
| Cache write | 0 | $12.50 | $0 |
| Cache read | 0 | $0.25 | $0 |
| Output | 22 | $50.00 | $0.0011 |
| of which reasoning | not recorded | billed as output |
- Total computed from tokens
- $0.0201
- Total reported by the harness
- $0.0198
- Difference
- computed $0.02 vs harness $0.02 (diff +0.00)
computed from harness-reported token counts x list prices; harness also reported a total. Only the session-title side call is visible in CC /cost. Any thinking tokens Fable generated before the stream was cut are not visible to us.
Prices: project price table 2026-09-22 (Anthropic list); cache write 1.25x input per Anthropic docs, 2026-09-23.
Run notes
- Mode: interactive TUI in tmux, bwrap sandbox
- Context setting: claude-fable-5-1[1m] (1M window)
- Isolation: bwrap sandbox
- Isolation audit: none (no tool calls)