Claude 3.5 Sonnet vs Claude Opus 5
Live Unit Economics, TTFT Latency & Reasoning Benchmark Analysis
Which model is better: Claude 3.5 Sonnet or Claude Opus 5?
Verified Performance & Unit Economics Delta
Daily synchronized metrics from synthetic latency endpoints and benchmark evaluations.
| Metric / Dimension | Claude 3.5 Sonnet | Claude Opus 5 | Net Delta / Advantage |
|---|---|---|---|
| Input Cost / 1M Tokens | $3.00 | $5.00 | Claude 3.5 Sonnet is 1.7x cheaper |
| Output Cost / 1M Tokens | $15.00 | $25.00 | Claude 3.5 Sonnet (40% lower) |
| Avg TTFT Response Latency | 320ms | 340ms | Claude 3.5 Sonnet (+20ms faster) |
| SWE-bench Verified (Coding) | 63.7% | 82.4% | Claude Opus 5 (+18.7% lead) |
| Inference Value Score (IVR) | 46 / 100 | 42.7 / 100 | Claude 3.5 Sonnet (+3.3 pts) |
Interactive Monthly Token Economics & ROI Forecaster
Model your expected production workload across prompt (input) and completion (output) tokens.
Estimated Monthly Spend
$3/1M in · $15/1M out
$5/1M in · $25/1M out
When to Choose Claude 3.5 Sonnet
Choose Claude 3.5 Sonnet when you need Full-stack code generation, production AI agents, complex visual diagram parsing, and enterprise document workflows. and have an infrastructure budget aligned with $3.00/1M tokens.
When to Choose Claude Opus 5
Choose Claude Opus 5 when you need Pinnacle autonomous software architecture, whole-system enterprise codebases, PhD-level scientific synthesis, and complex multi-agent delegation. and prioritize Anthropic ecosystem integration at $5.00/1M tokens.
Related Questions & Decision Factors
Which is cheaper: Claude 3.5 Sonnet or Claude Opus 5?
Claude 3.5 Sonnet is cheaper at $3.00/1M input tokens compared to $5.00/1M for Claude Opus 5.
Which model has lower latency: Claude 3.5 Sonnet or Claude Opus 5?
Claude 3.5 Sonnet delivers faster response times with an average TTFT of 320ms vs 340ms for Claude Opus 5.
When should you choose Claude 3.5 Sonnet?
Choose Claude 3.5 Sonnet when you need Full-stack code generation, production AI agents, complex visual diagram parsing, and enterprise document workflows. and have an infrastructure budget aligned with $3.00/1M tokens.
When should you choose Claude Opus 5?
Choose Claude Opus 5 when you need Pinnacle autonomous software architecture, whole-system enterprise codebases, PhD-level scientific synthesis, and complex multi-agent delegation. and prioritize Anthropic ecosystem integration at $5.00/1M tokens.