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
#128 by perf·#18 by attention
Claude Opus 4.6 (Fast)
#150 by perf·no signal
Best value
Claude Sonnet 4.6
11.1x 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 +26.8
Artificial Analysis Agentic Index · a composite score measuring how well a model performs in agentic workflows · multi-step tool use, planning, error recovery, and autonomous task completion. Aggregates results from multiple agentic benchmarks including SWE-bench, tool-use tests, and planning evaluations. The canonical single-number metric for "how good is this model as an agent?"
Claude Sonnet 4.6
40.8
Claude Opus 4.6 (Fast)
67.6
Artificial Analysis · Coding Index
Claude Sonnet 4.6 leads by +14.9
Artificial Analysis Coding Index · a composite score that aggregates performance across multiple coding benchmarks into a single index. Tracks code generation quality, debugging ability, multi-language competence, and real-world software engineering tasks. Used by Artificial Analysis to rank model coding capability in a normalized, comparable format. Useful for developers choosing between models for coding-heavy workloads.
Claude Sonnet 4.6
63.0
Claude Opus 4.6 (Fast)
48.1
Artificial Analysis · Quality Index
Claude Opus 4.6 (Fast) leads by +5.7
Claude Sonnet 4.6
47.2
Claude Opus 4.6 (Fast)
53.0
Chatbot Arena Elo · Coding
Claude Opus 4.6 (Fast) leads by +21.2
Claude Sonnet 4.6
1521.0
Claude Opus 4.6 (Fast)
1542.2
Chatbot Arena Elo · Overall
Claude Opus 4.6 (Fast) leads by +32.0
Claude Sonnet 4.6
1471.7
Claude Opus 4.6 (Fast)
1503.7
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 Artificial Analysis Agentic Index · a composite score measuring how well a model performs in agentic workflows · multi-step tool use, planning, error recovery, and autonomous task completion. Aggregates results from multiple agentic benchmarks including SWE-bench, tool-use tests, and planning evaluations. The canonical single-number metric for "how good is this model as an agent?" | 40.8 | 67.6 |
Artificial Analysis · Coding Index Artificial Analysis Coding Index · a composite score that aggregates performance across multiple coding benchmarks into a single index. Tracks code generation quality, debugging ability, multi-language competence, and real-world software engineering tasks. Used by Artificial Analysis to rank model coding capability in a normalized, comparable format. Useful for developers choosing between models for coding-heavy workloads. | 63.0 | 48.1 |
Artificial Analysis · Quality Index | 47.2 | 53.0 |
Chatbot Arena Elo · Coding | 1521.0 | 1542.2 |
Chatbot Arena Elo · Overall | 1471.7 | 1503.7 |
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 |
|---|---|---|---|---|
| $3.00 | $15.00 | 1.0M tokens (~500 books) | $60.00 | |
| $30.00 | $150.00 | 1.0M tokens (~500 books) | $600.00 |
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