GPT-5 Pro vs o3 Mini
GPT-5 Pro (2025) and o3 Mini (2025) are frontier reasoning models from OpenAI. GPT-5 Pro ships a 400k-token context window, while o3 Mini ships a 200k-token context window. On pricing, o3 Mini costs $1.10/1M input tokens versus $15/1M for the alternative. This comparison covers specs, pricing, API access, capabilities, benchmarks, input and output token costs, and production fit for coding and agent workloads.
o3 Mini is ~1264% cheaper at $1.10/1M; pay for GPT-5 Pro only for coding workflow support.
Decision scorecard
Local evidence first| Signal | GPT-5 Pro | o3 Mini |
|---|---|---|
| Best for | multimodal apps, tool-calling agents, and provider-routed production | reasoning-heavy apps, tool-calling agents, and provider-routed production |
| Decision fit | Coding, RAG, and Agents | Coding, RAG, and Agents |
| Context window | 400k | 200k |
| Cheapest output | $120/1M tokens | $4.40/1M tokens |
| Provider routes | 3 tracked | 4 tracked |
| Shared benchmarks | 0 shared | 0 shared |
Decision tradeoffs
- GPT-5 Pro has the larger context window for long prompts, retrieval packs, or transcript analysis.
- GPT-5 Pro uniquely exposes Vision and Multimodal in local model data.
- Local decision data tags GPT-5 Pro for Coding, RAG, and Agents.
- o3 Mini has the lower cheapest tracked output price at $4.40/1M tokens.
- o3 Mini has broader tracked provider coverage for fallback and route flexibility.
- o3 Mini uniquely exposes Reasoning in local model data.
- Local decision data tags o3 Mini for Coding, RAG, and Agents.
Monthly cost at traffic
Estimate token spend from the cheapest tracked input and output route or tier on this page.
GPT-5 Pro
$42,000
Cheapest tracked route/tier: Vercel AI Gateway
o3 Mini
$1,980
Cheapest tracked route/tier: OpenRouter
Estimated monthly gap: $40,020. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.
Switch friction
- Provider overlap exists on OpenRouter, OpenAI API, and Vercel AI Gateway; start route-level A/B tests there.
- o3 Mini is $116/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
- Check replacement coverage for Vision and Multimodal before moving production traffic.
- o3 Mini adds Reasoning in local capability data.
- Provider overlap exists on Vercel AI Gateway, OpenRouter, and OpenAI API; start route-level A/B tests there.
- GPT-5 Pro is $116/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
- Check replacement coverage for Reasoning before moving production traffic.
- GPT-5 Pro adds Vision and Multimodal in local capability data.
Specs
| Specification | ||
|---|---|---|
| Released | 2025-10-01 | 2025-01-31 |
| Context window | 400k | 200k |
| Parameters | — | — |
| Architecture | Decoder Only | Decoder Only |
| License | Proprietary | Proprietary |
| Openness | Proprietary | Proprietary |
| Weights | Not released | Not released |
| Code | Unknown | Unknown |
| Commercial use | Commercial use: conditional | Commercial use: conditional |
| Knowledge cutoff | 2024-09 | 2025-04 |
Pricing and availability
| Pricing attribute | GPT-5 Pro | o3 Mini |
|---|---|---|
| Input price | $15/1M tokens | $1.10/1M tokens |
| Output price | $120/1M tokens | $4.40/1M tokens |
| Providers |
Capabilities
| Capability | GPT-5 Pro | o3 Mini |
|---|---|---|
| Vision | Yes | No |
| Multimodal | Yes | No |
| Reasoning | No | Yes |
| JSON / Tool use | Yes | Yes |
| Structured outputs | Yes | Yes |
| Code execution | Yes | Yes |
| IDE integration | No | No |
| Computer use | No | No |
| Parallel agents | No | No |
Benchmarks
No shared benchmark scores are currently available for this pair.
Continue comparing
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Last reviewed: 2026-06-29. Data sourced from public model cards and provider documentation.