Claude 3.5 Sonnet vs GPT-4.5
Live Unit Economics, TTFT Latency & Reasoning Benchmark Analysis
Which model is better: Claude 3.5 Sonnet or GPT-4.5?
Verified Performance & Unit Economics Delta
Daily synchronized metrics from synthetic latency endpoints and benchmark evaluations.
| Metric / Dimension | Claude 3.5 Sonnet | GPT-4.5 | Net Delta / Advantage |
|---|---|---|---|
| Input Cost / 1M Tokens | $3.00 | $75.00 | Claude 3.5 Sonnet is 25.0x cheaper |
| Output Cost / 1M Tokens | $15.00 | $150.00 | Claude 3.5 Sonnet (90.0% lower) |
| Prompt Cache Read / 1M | $0.300 | $37.500 | Claude 3.5 Sonnet is 125.0x cheaper |
| Prompt Cache Write / 1M | $3.75 | $75.00 | Claude 3.5 Sonnet is 20.0x cheaper |
| Avg TTFT Response Latency | 310ms | 850ms | Claude 3.5 Sonnet (+540ms faster) |
| SWE-bench Verified (Coding) | 49% | 38% | Claude 3.5 Sonnet (+11.0% lead) |
| Inference Value Score (IVR) | 47.3 / 100 | 22.1 / 100 | Claude 3.5 Sonnet (+25.2 pts) |
Interactive Monthly Token Economics & ROI Forecaster
Model your expected production workload across prompt (input) and completion (output) tokens with prompt caching economics.
Estimated Monthly Spend
$3.00/1M in · $15.00/1M out
Prompt Cache: $0.300/1M read · $3.75/1M write
$75.00/1M in · $150.00/1M out
Prompt Cache: $37.500/1M read · $75.00/1M write
When to Choose Claude 3.5 Sonnet
Choose Claude 3.5 Sonnet when you need Industry benchmark for complex software engineering, intricate reasoning, and human-like prose composition. and have an infrastructure budget aligned with $3.00/1M tokens.
When to Choose GPT-4.5
Choose GPT-4.5 when you need Deep world-knowledge synthesis, high-EQ conversational nuance, and long-form creative generation requiring massive pretraining breadth. and prioritize OpenAI ecosystem integration at $75.00/1M tokens.
Related Questions & Decision Factors
Which is cheaper: Claude 3.5 Sonnet or GPT-4.5?
Claude 3.5 Sonnet is cheaper at $3.00/1M input tokens compared to $75.00/1M for GPT-4.5.
Which model has lower latency: Claude 3.5 Sonnet or GPT-4.5?
Claude 3.5 Sonnet delivers faster response times with an average TTFT of 310ms vs 850ms for GPT-4.5.
When should you choose Claude 3.5 Sonnet?
Choose Claude 3.5 Sonnet when you need Industry benchmark for complex software engineering, intricate reasoning, and human-like prose composition. and have an infrastructure budget aligned with $3.00/1M tokens.
When should you choose GPT-4.5?
Choose GPT-4.5 when you need Deep world-knowledge synthesis, high-EQ conversational nuance, and long-form creative generation requiring massive pretraining breadth. and prioritize OpenAI ecosystem integration at $75.00/1M tokens.