GPT-4o Mini (07-18) vs o3
GPT-4o Mini (07-18) (2024) and o3 (2025) are frontier reasoning models from OpenAI. GPT-4o Mini (07-18) ships a 128K-token context window, while o3 ships a 200K-token context window. On Aider Polyglot, o3 leads by 77.7 pts. On pricing, GPT-4o Mini (07-18) costs $0.15/1M input tokens versus $2/1M for the alternative. This comparison covers specs, pricing, capabilities, benchmarks, provider availability, and production fit.
GPT-4o Mini (07-18) is ~1233% cheaper at $0.15/1M; pay for o3 only for coding workflow support.
Specs
| Specification | ||
|---|---|---|
| Released | 2024-07-18 | 2025-03-31 |
| Context window | 128K | 200K |
| Parameters | — | — |
| Architecture | decoder only | decoder only |
| License | Proprietary | Proprietary |
| Knowledge cutoff | 2023-10 | - |
Pricing and availability
| Pricing attribute | GPT-4o Mini (07-18) | o3 |
|---|---|---|
| Input price | $0.15/1M tokens | $2/1M tokens |
| Output price | $0.6/1M tokens | $8/1M tokens |
| Providers |
Capabilities
| Capability | GPT-4o Mini (07-18) | o3 |
|---|---|---|
| Vision | Yes | No |
| Multimodal | No | No |
| Reasoning | No | Yes |
| Function calling | No | No |
| Tool use | No | No |
| Structured outputs | Yes | Yes |
| Code execution | Yes | Yes |
Benchmarks
| Benchmark | GPT-4o Mini (07-18) | o3 |
|---|---|---|
| Aider Polyglot | 3.6 | 81.3 |
Deep dive
On shared benchmark coverage, Aider Polyglot has GPT-4o Mini (07-18) at 3.6 and o3 at 81.3, with o3 ahead by 77.7 points. The largest visible gap is 77.7 points on Aider Polyglot, 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 vision: GPT-4o Mini (07-18) and reasoning mode: o3. Both models share structured outputs and code execution, 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-4o Mini (07-18) lists $0.15/1M input and $0.6/1M output tokens, while o3 lists $2/1M input and $8/1M output tokens on the cheapest tracked provider. A 70/30 input-output blend puts GPT-4o Mini (07-18) lower by about $3.51 per million blended tokens. Availability is 3 providers versus 2, so concentration risk also matters.
Choose GPT-4o Mini (07-18) when coding workflow support, lower input-token cost, and broader provider choice are central to the workload. Choose o3 when coding workflow support and larger context windows are more important. For production, rerun your own prompts through the exact provider, region, and tool stack you plan to ship.
FAQ
Which has a larger context window, GPT-4o Mini (07-18) or o3?
o3 supports 200K tokens, while GPT-4o Mini (07-18) supports 128K tokens. That gap matters most for long documents, large codebases, retrieval-heavy agents, and conversations where earlier context must remain visible.
Which is cheaper, GPT-4o Mini (07-18) or o3?
GPT-4o Mini (07-18) is cheaper on tracked token pricing. GPT-4o Mini (07-18) costs $0.15/1M input and $0.6/1M output tokens. o3 costs $2/1M input and $8/1M output tokens. Provider discounts or batch pricing can still change the final bill.
Is GPT-4o Mini (07-18) or o3 open source?
GPT-4o Mini (07-18) is listed under Proprietary. o3 is listed under Proprietary. 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 vision, GPT-4o Mini (07-18) or o3?
GPT-4o Mini (07-18) has the clearer documented vision signal in this comparison. If vision 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-4o Mini (07-18) or o3?
o3 has the clearer documented reasoning mode signal in this comparison. If reasoning mode is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.
Where can I run GPT-4o Mini (07-18) and o3?
GPT-4o Mini (07-18) is available on OpenAI API, OpenRouter, and Replicate API. o3 is available on OpenAI API and OpenRouter. Provider coverage can affect latency, region availability, compliance posture, and fallback options.
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Last reviewed: 2026-05-11. Data sourced from public model cards and provider documentation.