GPT-5.2 vs o3
GPT-5.2 (2025) and o3 (2025) are frontier-tier reasoning models from OpenAI. GPT-5.2 ships a 400k-token context window, while o3 ships a 200k-token context window. On SWE-bench Verified, GPT-5.2 leads by 8.3 pts. On pricing, GPT-5.2 costs $1.75/1M input tokens versus $2/1M 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.
Pick GPT-5.2 for coding; o3 is better when coding workflow support matters more.
Decision scorecard
Local evidence first| Signal | GPT-5.2 | o3 |
|---|---|---|
| Best for | reasoning-heavy apps, multimodal apps, and tool-calling agents | reasoning-heavy apps, multimodal apps, and tool-calling agents |
| Decision fit | Coding, RAG, and Agents | Coding, RAG, and Agents |
| Context window | 400k | 200k |
| Cheapest output | $14/1M tokens | $8/1M tokens |
| Provider routes | 3 tracked | 3 tracked |
| Shared benchmarks | SWE-bench Verified leader | 2 shared |
Decision tradeoffs
- GPT-5.2 holds a shared-benchmark lead on SWE-bench Verified, ahead by 8.3 points.
- GPT-5.2 has the larger context window for long prompts, retrieval packs, or transcript analysis.
- Local decision data tags GPT-5.2 for Coding, RAG, and Agents.
- o3 has the lower cheapest tracked output price at $8/1M tokens.
- Local decision data tags o3 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-5.2
$4,900
Cheapest tracked route/tier: Replicate API
o3
$3,600
Cheapest tracked route/tier: OpenAI API
Estimated monthly gap: $1,300. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.
Switch friction
- Provider overlap exists on OpenRouter and Vercel AI Gateway; start route-level A/B tests there.
- o3 is $6/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
- Provider overlap exists on OpenRouter and Vercel AI Gateway; start route-level A/B tests there.
- GPT-5.2 is $6/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
Specs
| Specification | ||
|---|---|---|
| Released | 2025-12-11 | 2025-04-16 |
| 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 | 2025-08 | 2024-06 |
Pricing and availability
| Pricing attribute | GPT-5.2 | o3 |
|---|---|---|
| Input price | $1.75/1M tokens | $2/1M tokens |
| Output price | $14/1M tokens | $8/1M tokens |
| Providers |
Capabilities
| Capability | GPT-5.2 | o3 |
|---|---|---|
| Vision | Yes | Yes |
| Multimodal | Yes | Yes |
| Reasoning | Yes | 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
| Benchmark | GPT-5.2 | o3 |
|---|---|---|
| SWE-bench Verified | 80.0 | 71.7 |
| MMMU Pro | 79.5 | 76.4 |
Continue comparing
Popular comparisons for GPT-5.2
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Last reviewed: 2026-06-29. Data sourced from public model cards and provider documentation.