Sonnet vs Opus is the intra-Anthropic question. After Jun 30 / Jul 24 that is Sonnet 5 vs Opus 5. Sonnet is the workhorse at $2/$10. Opus is the high-capability reasoning model at $5/$25. If the coding delta is small and you run thousands of agent turns, Sonnet is the default. If the task requires deep multi-step computer-use, pay Opus and measure on your eval.
Family pairs are not doorways
The numbers differ on price, SWE-bench, and TTFT. That is enough unique data. We still write this dispatch so the query has a dated explanation of the Aug 10 permanent Sonnet price.
Empirical Evaluation & Architectural Analysis
Standardized telemetry recorded in the verified CompareLLM Leaderboards captures distinct architectural priorities between Claude Sonnet 5 and Claude Opus 5. While blind human pairwise preference testing reflects instruction compliance and reasoning depth, domain-specific suites such as SWE-bench Verified and GPQA Diamond highlight coding execution and advanced STEM reasoning. For the live pairwise breakdown with historical trendlines, reference the interactive scorecard above or visit the Claude Sonnet 5 vs Claude Opus 5 Showdown.
Fable is the third sibling
If you are comparing invoices, include Fable 5 only when you actually need the $10/$50 X-High reasoning tier.
Strategic Deployment Recommendation
- Production Workloads: For enterprise workloads requiring strict reliability, cross-reference Top Coding LLMs and Cheapest High-Quality LLMs.
- Direct Pair Comparison: Explore the live pairwise breakdown at /compare/claude-opus-5-vs-claude-sonnet-5.
- Architectural Stacks: Recommended architectural configurations can be evaluated on the CompareLLM Stack Engine.
Frequently Asked Questions
Is this an CompareLLM lab test score? No. Linked model dossiers and compare showdowns reflect dated snapshots gathered from named public evaluation benchmarks. Seed catalog entries remain transparently timestamped until daily ingest updates them.
Where can I see live comparisons for this model? View the showdown at /compare/claude-opus-5-vs-claude-sonnet-5.
What primary search query does this briefing answer? sonnet vs opus.