Compare · ModelsLive · 2 picked · head to head
Claude Sonnet 4.6 vs Claude Opus 4.6 (Fast)
Side by side · benchmarks, pricing, and signals you can act on.
Winner summary
Claude Opus 4.6 (Fast) wins on 6/7 benchmarks
Claude Opus 4.6 (Fast) wins 6 of 7 shared benchmarks. Leads in speed · arena · agentic.
Category leads
speed·Claude Opus 4.6 (Fast)arena·Claude Opus 4.6 (Fast)agentic·Claude Opus 4.6 (Fast)
Hype vs Reality
Attention vs performance
Claude Sonnet 4.6
#102 by perf·#18 by attention
Claude Opus 4.6 (Fast)
#120 by perf·no signal
Best value
Claude Sonnet 4.6
11.0x better value than Claude Opus 4.6 (Fast)
Claude Sonnet 4.6
5.3 pts/$
$9.00/M
Claude Opus 4.6 (Fast)
0.5 pts/$
$90.00/M
Vendor risk
Who is behind the model
Anthropic
$380.0B·Tier 1
Anthropic
$380.0B·Tier 1
Head to head
7 benchmarks · 2 models
Claude Sonnet 4.6Claude Opus 4.6 (Fast)
Artificial Analysis · Agentic Index
Claude Opus 4.6 (Fast) leads by +4.6
Claude Sonnet 4.6
63.0
Claude Opus 4.6 (Fast)
67.6
Artificial Analysis · Coding Index
Claude Sonnet 4.6 leads by +2.8
Claude Sonnet 4.6
50.9
Claude Opus 4.6 (Fast)
48.1
Artificial Analysis · Quality Index
Claude Opus 4.6 (Fast) leads by +1.2
Claude Sonnet 4.6
51.7
Claude Opus 4.6 (Fast)
53.0
Chatbot Arena Elo · Coding
Claude Opus 4.6 (Fast) leads by +25.2
Claude Sonnet 4.6
1521.0
Claude Opus 4.6 (Fast)
1546.2
Chatbot Arena Elo · Overall
Claude Opus 4.6 (Fast) leads by +40.5
Claude Sonnet 4.6
1462.2
Claude Opus 4.6 (Fast)
1502.8
SWE Atlas · Codebase QnA
Claude Opus 4.6 (Fast) leads by +2.1
Claude Sonnet 4.6
31.2
Claude Opus 4.6 (Fast)
33.3
SWE Atlas · Test Writing
Claude Opus 4.6 (Fast) leads by +4.9
Claude Sonnet 4.6
31.8
Claude Opus 4.6 (Fast)
36.7
Full benchmark table
| Benchmark | Claude Sonnet 4.6 | Claude Opus 4.6 (Fast) |
|---|---|---|
Artificial Analysis · Agentic Index | 63.0 | 67.6 |
Artificial Analysis · Coding Index | 50.9 | 48.1 |
Artificial Analysis · Quality Index | 51.7 | 53.0 |
Chatbot Arena Elo · Coding | 1521.0 | 1546.2 |
Chatbot Arena Elo · Overall | 1462.2 | 1502.8 |
SWE Atlas · Codebase QnA | 31.2 | 33.3 |
SWE Atlas · Test Writing | 31.8 | 36.7 |
Pricing · per 1M tokens · projected $/mo at 10M tokens
| Model | Input | Output | Context | Projected $/mo |
|---|---|---|---|---|
| Claude Sonnet 4.6 | $3.00 | $15.00 | 1.0M tokens (~500 books) | $60.00 |
| Claude Opus 4.6 (Fast) | $30.00 | $150.00 | 1.0M tokens (~500 books) | $600.00 |