GPT-4.5 vs OpenAI o3-mini
Live Unit Economics, TTFT Latency & Reasoning Benchmark Analysis
Which model is better: GPT-4.5 or OpenAI o3-mini?
Verified Performance & Unit Economics Delta
Daily synchronized metrics from synthetic latency endpoints and benchmark evaluations.
| Metric / Dimension | GPT-4.5 | OpenAI o3-mini | Net Delta / Advantage |
|---|---|---|---|
| Input Cost / 1M Tokens | $75.00 | $1.10 | OpenAI o3-mini is 68.2x cheaper |
| Output Cost / 1M Tokens | $150.00 | $4.40 | OpenAI o3-mini (97.1% lower) |
| Prompt Cache Read / 1M | $37.500 | $0.550 | OpenAI o3-mini is 68.2x cheaper |
| Prompt Cache Write / 1M | $75.00 | $1.10 | OpenAI o3-mini is 68.2x cheaper |
| Avg TTFT Response Latency | 850ms | 1250ms | GPT-4.5 (+400ms faster) |
| SWE-bench Verified (Coding) | 38% | 49.3% | OpenAI o3-mini (+11.3% lead) |
| Inference Value Score (IVR) | 22.1 / 100 | 58.2 / 100 | OpenAI o3-mini (+36.1 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
$75.00/1M in · $150.00/1M out
Prompt Cache: $37.500/1M read · $75.00/1M write
$1.10/1M in · $4.40/1M out
Prompt Cache: $0.550/1M read · $1.10/1M write
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 have an infrastructure budget aligned with $75.00/1M tokens.
When to Choose OpenAI o3-mini
Choose OpenAI o3-mini when you need High-throughput STEM reasoning, competitive coding, and low-latency algorithmic problem solving with configurable thinking effort. and prioritize OpenAI ecosystem integration at $1.10/1M tokens.
Related Questions & Decision Factors
Which is cheaper: GPT-4.5 or OpenAI o3-mini?
OpenAI o3-mini is cheaper at $1.10/1M input tokens compared to $75.00/1M for GPT-4.5.
Which model has lower latency: GPT-4.5 or OpenAI o3-mini?
GPT-4.5 delivers faster response times with an average TTFT of 850ms vs 1250ms for OpenAI o3-mini.
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 have an infrastructure budget aligned with $75.00/1M tokens.
When should you choose OpenAI o3-mini?
Choose OpenAI o3-mini when you need High-throughput STEM reasoning, competitive coding, and low-latency algorithmic problem solving with configurable thinking effort. and prioritize OpenAI ecosystem integration at $1.10/1M tokens.