aiintelligence

Claude Fable 5

It helps users write computer code and analyze text, images, and files.

anthropic’s large language model, able to hold about 1000k tokens of context (roughly 750k words) in one conversation, working across text and image and file->text. You reach it through an API or through tools built on it. Built for knowledge workers and computer programmers. anthropic describes it as: “Claude Fable 5 is a Mythos-class model from Anthropic, built for autonomous knowledge work and coding.” source ↗

Our tested score
79/100 · Meetings & notes
12 tasks, marked blind by 3 judges · 28 Aug 2026 · receipts
88/100 · Research agents
12 tasks, marked blind by 3 judges · 27 Aug 2026 · receipts
89/100 · Bookkeeping & accounts
12 tasks, marked blind by 3 judges · 27 Aug 2026 · receipts
86/100 · Property & lettings
12 tasks, marked blind by 3 judges · 18 Aug 2026 · receipts
95/100 · Humanising AI text
12 tasks, marked blind by 3 judges · 16 Aug 2026 · receipts
94/100 · Book writing
12 tasks, marked blind by 3 judges · 16 Aug 2026 · receipts
89/100 · Health questions
12 tasks, marked blind by 3 judges · 16 Aug 2026 · receipts
93/100 · Legal questions
12 tasks, marked blind by 3 judges · 16 Aug 2026 · receipts
97/100 · Emotional support
12 tasks, marked blind by 3 judges · 16 Aug 2026 · receipts
93/100 · Travel planning
12 tasks, marked blind by 3 judges · 16 Aug 2026 · receipts
91/100 · Creative writing
12 tasks, marked blind by 3 judges · 16 Aug 2026 · receipts
92/100 · Research
12 tasks, marked blind by 3 judges · 16 Aug 2026 · receipts
92/100 · CV writing
12 tasks, marked blind by 3 judges · 16 Aug 2026 · receipts
92/100 · Presentations
12 tasks, marked blind by 3 judges · 16 Aug 2026 · receipts
88/100 · Job applications
12 tasks, marked blind by 3 judges · 16 Aug 2026 · receipts
85/100 · Social posts
12 tasks, marked blind by 3 judges · 16 Aug 2026 · receipts
91/100 · Flashcards
12 tasks, marked blind by 3 judges · 16 Aug 2026 · receipts
80/100 · Study notes
12 tasks, marked blind by 3 judges · 14 Aug 2026 · receipts
88/100 · Customer replies
12 tasks, marked blind by 3 judges · 14 Aug 2026 · receipts
96/100 · Maths
12 tasks, marked blind by 3 judges · 14 Aug 2026 · receipts
86/100 · Emails
12 tasks, marked blind by 3 judges · 14 Aug 2026 · receipts
94/100 · Extraction
12 tasks, marked blind by 3 judges · 13 Aug 2026 · receipts
93/100 · Summarising
12 tasks, marked blind by 3 judges · 13 Aug 2026 · receipts
83/100 · Essays
12 tasks, marked blind by 3 judges · 13 Aug 2026 · receipts
89/100 · Spreadsheets
12 tasks, marked blind by 3 judges · 13 Aug 2026 · receipts
API price (per 1M in/out)
$10 / $50
OpenRouter API21 Sept 2026
Community Elo (text)
1493
LMArena leaderboard (CC-BY-4.0)14 Sept 2026
Battle record
unfought
no battle yet — we don't guess
Forum sentiment — 90d to 12 Aug 2026
9%
developer-forum posts: 23 opinions in 113
stale — measured 40 days ago, not re-swept since
What people are posting (90 days)
Loudest post this quarter
“[BUG] Fable 5 prompts 'usage credits required' on Max plan from 2026-07-20, the day it became standard on Max (saved model claude-fable-5[1m])”

Compare Claude Fable 5 against…

Claude Opus 4.8 · summarising documentsGPT-5.5 · summarising documentsGPT-5.6 Luna · summarising documentsGPT-5.6 Terra · summarising documentsGPT-5.3-Codex · summarising documentsDeepSeek V4 Pro · summarising documentsGPT-5.6 Sol · summarising documentsClaude Sonnet 5 · summarising documentsClaude Opus 4.6 · summarising documentsGPT-5.6 Luna · presentations and slidesGPT-5.5 · presentations and slidesGPT-5.3-Codex · presentations and slidesGPT-5.6 Terra · presentations and slidesGPT-5.6 Sol · presentations and slidesClaude Opus 4.8 · presentations and slidesDeepSeek V4 Pro · presentations and slidesGrok 4.5 · presentations and slidesQwen3.7 Max · presentations and slidesGPT-5.5 · CV writing
Every claim we hold (6)