Claude Fable 5.1
anthropic/claude-fable-5-1
most capable for demanding reasoning & long-horizon agents.
cmd --model claude-fable-5-1
Intelligence index
53.4
Coding index
81.6
Input
$10 /M
Output
$50 /M
Cache read
$0.25 /M
Agent-loop cost
$3.18 /M in
Context window
1M tokens
Released
September 1, 2026
Modalities
→
vs. the lineup
Claude Fable 5.1 beside its stablemates and nearest rivals. The ◆ marks the best value in each column across every row shown.
pin a rival:
| Model | Intelligence | Coding | Input $/M | Output $/M | Blended $/M | Context |
|---|---|---|---|---|---|---|
| Claude Opus 5.5 | 57.6◆ | —◆ | $4◆ | $20◆ | $8◆ | 1M◆ |
| Claude Sonnet 5.5 | 56◆ | —◆ | $2◆ | $10◆ | $4◆ | 1M◆ |
| Claude Fable 5.1 ◆ | 53.4◆ | 81.6◆ | $10◆ | $50◆ | $20◆ | 1M◆ |
| Claude Fable 5 | 49.6◆ | 76.5◆ | $10◆ | $50◆ | $20◆ | 1M◆ |
| Claude Sonnet 5 | 38.2◆ | 71.5◆ | $2◆ | $10◆ | $4◆ | 1M◆ |
| Claude Sonnet 4.6 | 30.1◆ | 63◆ | $3◆ | $15◆ | $6◆ | 1M◆ |
| DeepSeek V4 Pro (latest)pinned | 36◆ | 68.8◆ | $0.66◆ | $1.98◆ | $0.99◆ | 1M◆ |
| DeepSeek V4 Flash (latest)pinned | 34◆ | 69.1◆ | $0.15◆ | $0.60◆ | $0.26◆ | 1M◆ |
coding performance
The Intelligence Index and its sub-scores, ranked against every scored model in the catalog. A metric that has not been measured for Claude Fable 5.1 has been left empty.
Coding Index
81.6
#1 of 52 scored
Terminal-Bench
91.4
#1 of 52 scored
Intelligence Index
53.4
#3 of 73 scored
Long-context reasoning
85.3
reasoning across a long context
SciCode
63.1
scientific coding
GPQA Diamond
93.7
graduate-level QA
usage calculator
How far a month of credits goes on Claude Fable 5.1.
Claude Fable 5.1 runs on Max and up — from $100/mo.
Input tokensfresh prompt
800Output tokensmodel reply
180Cache read tokensre-read context
50Kcost / request $0.030 · in $10 · out $50 · cache $0.25 per M
fresh input 27%output 31%cache reads 42%
Requests / 30 days
3.4K
$100 credits ÷ $0.030 per request
~678 quick fixes~136 bug fixes~23 feature PRs
what real work costs
Real coding tasks priced end to end on Claude Fable 5.1, from a quick lookup to a full-repo agent run.
One agent task
$1.08
180K in at 75% cache hit, 12K out
What you pay
$5.64 /M
all-in across every token that task touched
Sticker input
$10 /M
cache reads bill at $0.25 /M instead
| Task | Tokens in · out | Claude Fable 5.1 | Claude Opus 5.5 | Claude Haiku 4.5 |
|---|---|---|---|---|
| Quick lookup / one-liner | 8K · 1K | $0.06 | $0.02 | $0.0065 |
| Review a 500-line PR | 60K · 4K | $0.39 | $0.16 | $0.04 |
| Fix a bug (agent loop) | 180K · 12K | $1.08 | $0.45 | $0.12 |
| Refactor a module | 320K · 20K | $1.95 | $0.80 | $0.21 |
| Full-repo agent run | 900K · 45K | $4.41 | $1.83 | $0.49 |
frequently asked
How much does Claude Fable 5.1 cost?
$10/M input and $50/M output, cache reads $0.25/M. In an agent loop most input is cache-read, so the effective input rate is about $3.18/M.Which plan do I need?
Available on Max and above.
How do I switch to it?
Run
cmd --model claude-fable-5-1, or type /model in a session and pick it. You can switch mid-session without losing context.Ship code that matches your taste
Command Code is the AI coding agent that continuously learns your taste. Start for $1.
Benchmarks from Artificial Analysis (v4.3)commandcode.ai/models/claude-fable-5-1