Claude Sonnet 4.6
anthropic/claude-sonnet-4-6
older Sonnet, still fast & capable.
cmd --model claude-sonnet-4-6
Intelligence index
30.1
Coding index
63
Input
$3 /M
Output
$15 /M
Cache read
$0.30 /M
Agent-loop cost
$1.11 /M in
Context window
1M tokens
Released
February 17, 2026
Modalities
→
vs. the lineup
Claude Sonnet 4.6 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 Sonnet 4.6 has been left empty.
Coding Index
63
#33 of 50 scored
Terminal-Bench
71.2
#34 of 51 scored
Intelligence Index
30.1
#50 of 74 scored
Long-context reasoning
80
reasoning across a long context
SciCode
50.1
scientific coding
GPQA Diamond
87.5
graduate-level QA
usage calculator
How far a month of credits goes on Claude Sonnet 4.6.
Claude Sonnet 4.6 runs on Pro and up — from $20/mo.
Input tokensfresh prompt
800Output tokensmodel reply
180Cache read tokensre-read context
50Kcost / request $0.020 · in $3 · out $15 · cache $0.30 per M
fresh input 12%output 13%cache reads 75%
Requests / 30 days
995
$20 credits ÷ $0.020 per request
~199 quick fixes~40 bug fixes~7 feature PRs
what real work costs
Real coding tasks priced end to end on Claude Sonnet 4.6, from a quick lookup to a full-repo agent run.
One agent task
$0.36
180K in at 75% cache hit, 12K out
What you pay
$1.85 /M
all-in across every token that task touched
Sticker input
$3 /M
cache reads bill at $0.30 /M instead
| Task | Tokens in · out | Claude Sonnet 4.6 | Claude Sonnet 5.5 | Claude Haiku 4.5 |
|---|---|---|---|---|
| Quick lookup / one-liner | 8K · 1K | $0.02 | $0.01 | $0.0065 |
| Review a 500-line PR | 60K · 4K | $0.13 | $0.08 | $0.04 |
| Fix a bug (agent loop) | 180K · 12K | $0.36 | $0.22 | $0.12 |
| Refactor a module | 320K · 20K | $0.64 | $0.40 | $0.21 |
| Full-repo agent run | 900K · 45K | $1.48 | $0.92 | $0.49 |
frequently asked
How much does Claude Sonnet 4.6 cost?
$3/M input and $15/M output, cache reads $0.30/M. In an agent loop most input is cache-read, so the effective input rate is about $1.11/M.Which plan do I need?
Available on Pro and above.
How do I switch to it?
Run
cmd --model claude-sonnet-4-6, 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-sonnet-4-6