GPT-5.4 vs o3 Mini
GPT-5.4 (2026) and o3 Mini (2025) are frontier-tier reasoning models from OpenAI. GPT-5.4 ships a not-yet-sourced context window, while o3 Mini ships a not-yet-sourced context window. On MMLU PRO, GPT-5.4 leads by 8.4 pts. On pricing, o3 Mini costs $1.1/1M input tokens versus $2.5/1M for the alternative. This comparison covers specs, pricing, capabilities, benchmarks, provider availability, and production fit. It focuses on practical selection signals rather than broad model-family marketing.
o3 Mini is ~127% cheaper at $1.1/1M; pay for GPT-5.4 only for coding workflow support.
Specs
Pricing and availability
| GPT-5.4 | o3 Mini | |
|---|---|---|
| Input price | $2.5/1M tokens | $1.1/1M tokens |
| Output price | $15/1M tokens | $4.4/1M tokens |
| Providers |
Capabilities
| GPT-5.4 | o3 Mini | |
|---|---|---|
| Vision | ||
| Multimodal | ||
| Reasoning | ||
| Function calling | ||
| Tool use | ||
| Structured outputs | ||
| Code execution |
Benchmarks
| Benchmark | GPT-5.4 | o3 Mini |
|---|---|---|
| MMLU PRO | 87.5 | 79.1 |
| Google-Proof Q&A | 92.0 | 79.7 |
Deep dive
On shared benchmark coverage, MMLU PRO has GPT-5.4 at 87.5 and o3 Mini at 79.1, with GPT-5.4 ahead by 8.4 points; Google-Proof Q&A has GPT-5.4 at 92 and o3 Mini at 79.7, with GPT-5.4 ahead by 12.3 points. The largest visible gap is 12.3 points on Google-Proof Q&A, which matters most when that benchmark mirrors your workload. Treat isolated benchmark wins as directional, because provider routing, prompt style, and tool access can move real application results.
The capability footprint differs most on multimodal input: GPT-5.4. Both models share reasoning mode, function calling, tool use, and structured outputs, so the practical split is not just feature count. Use those differences to decide whether the page is about raw model quality, agentic coding support, multimodal ingestion, or predictable structured API behavior.
For cost, GPT-5.4 lists $2.5/1M input and $15/1M output tokens, while o3 Mini lists $1.1/1M input and $4.4/1M output tokens on the cheapest tracked provider. A 70/30 input-output blend puts o3 Mini lower by about $4.16 per million blended tokens. Availability is 2 providers versus 3, so concentration risk also matters.
Choose GPT-5.4 when coding workflow support are central to the workload. Choose o3 Mini when coding workflow support, lower input-token cost, and broader provider choice are more important. For production, rerun your own prompts through the exact provider, region, and tool stack you plan to ship.
FAQ
Which is cheaper, GPT-5.4 or o3 Mini?
o3 Mini is cheaper on tracked token pricing. GPT-5.4 costs $2.5/1M input and $15/1M output tokens. o3 Mini costs $1.1/1M input and $4.4/1M output tokens. Provider discounts or batch pricing can still change the final bill.
Is GPT-5.4 or o3 Mini open source?
GPT-5.4 is listed under Proprietary. o3 Mini is listed under Unknown. License labels affect whether you can self-host, redistribute weights, or rely only on hosted APIs, so confirm the upstream license before deployment.
Which is better for multimodal input, GPT-5.4 or o3 Mini?
GPT-5.4 has the clearer documented multimodal input signal in this comparison. If multimodal input is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.
Which is better for reasoning mode, GPT-5.4 or o3 Mini?
Both GPT-5.4 and o3 Mini expose reasoning mode. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface. Use this as a quick comparison signal, then confirm the provider-specific limits before committing to production.
Which is better for function calling, GPT-5.4 or o3 Mini?
Both GPT-5.4 and o3 Mini expose function calling. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface. Use this as a quick comparison signal, then confirm the provider-specific limits before committing to production.
Where can I run GPT-5.4 and o3 Mini?
GPT-5.4 is available on OpenAI API and OpenRouter. o3 Mini is available on OpenRouter, OpenAI Batch API, and Azure OpenAI. Provider coverage can affect latency, region availability, compliance posture, and fallback options.
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Last reviewed: 2026-04-24. Data sourced from public model cards and provider documentation.