13d • General discussion 💬
Sonnet 4.6 vs Opus 4.6, Which one should you actually use?
Both dropped in February 2026.
Here's the real breakdown.
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SONNET 4.6 SPECS
Price: $3 / $15 per million tokens
Speed: 40–60 tokens/second
Max output: 64K tokens
Context window: 1M tokens (beta)
SWE-bench (coding): 79.6%
OSWorld (computer use): 72.5%
Office tasks: 1633 Elo
Finance Agent: 63.3%
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OPUS 4.6 SPECS
Price: $15 / $75 per million tokens
Speed: 20–30 tokens/second
Max output: 128K tokens
Context window: 1M tokens
SWE-bench (coding): 80.8%
OSWorld (computer use): 72.7%
Office tasks: 1606 Elo
Finance Agent: 60.1%
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WHEN TO USE SONNET 4.6
Daily coding and iteration
Content generation at scale
Office productivity tasks
Financial analysis
High-volume API calls
Speed-sensitive workflows
Tool integrations and agents
Sonnet actually beats Opus on office tasks and finance.
70% of developers preferred it over Sonnet 4.5.
59% preferred it over the previous flagship Opus 4.5.
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WHEN TO USE OPUS 4.6
Deep multi-step reasoning
Large codebase refactoring
Multi-agent coordination (Agent Teams)
Ultra-long context retrieval (800K+ tokens)
High-stakes analysis where failure is expensive
Tasks requiring 128K output in one shot
Opus still leads on Terminal-Bench and complex reasoning chains.
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SONNET DISADVANTAGES
Smaller max output (64K vs 128K)
Less reliable on ultra-long context retrieval
Can drift on deeply chained reasoning tasks
Not ideal when you need maximum accuracy on first attempt
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OPUS DISADVANTAGES
5x more expensive
2x slower
Overkill for 80–90% of daily tasks
Cost adds up fast at scale
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THE REAL ANSWER
Start with Sonnet as your default.
Escalate to Opus only when Sonnet isn't enough.
Most teams find that escalation rarely happens.
The 1.2% gap on coding benchmarks doesn't justify 5x the cost for most use cases.
What are you using?
Drop a comment with your use case and which model works better for you.
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Sonnet 4.6 vs Opus 4.6, Which one should you actually use?
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