GPT-5.2 Codex vs GPT-5.5
GPT-5.2 Codex (2025) and GPT-5.5 (2026) compare a coding-specialized model against a standalone API model. GPT-5.2 Codex ships a 400k-token context window, while GPT-5.5 ships a 1.05m-token context window. On SWE-bench Verified, GPT-5.5 leads by 9.8 pts. On pricing, GPT-5.2 Codex costs $1.75/1M input tokens; GPT-5.5 ranges from $5 to $8/1M input tokens by tier. This page treats the result as workflow and deployment fit, not a universal model winner.
Treat this as a product-type comparison: GPT-5.2 Codex is coding-specialized model, while GPT-5.5 is standalone API model. Choose based on workflow fit before reading any benchmark or price row as decisive.
Decision scorecard
Local evidence first| Signal | GPT-5.2 Codex | GPT-5.5 |
|---|---|---|
| Product type | Coding-specialized model | Standalone API model |
| Best for | custom coding agents, code generation, and tool loops | reasoning-heavy apps, multimodal apps, and tool-calling agents |
| Decision fit | Coding, RAG, and Agents | Coding, RAG, and Agents |
| Context window | 400k | 1.05m |
| Cheapest output | $14/1M tokens | $30/1M tokens |
| Provider routes | 2 tracked | 4 tracked |
| Shared benchmarks | 3 shared | SWE-bench Verified leader |
Decision tradeoffs
- GPT-5.2 Codex has the lower cheapest tracked output price at $14/1M tokens.
- Local decision data tags GPT-5.2 Codex for Coding, RAG, and Agents.
- GPT-5.5 holds a shared-benchmark lead on SWE-bench Verified, ahead by 9.8 points.
- GPT-5.5 has the larger context window for long prompts, retrieval packs, or transcript analysis.
- GPT-5.5 has broader tracked provider coverage for fallback and route flexibility.
- Local decision data tags GPT-5.5 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 Codex
$4,900
Cheapest tracked route/tier: Vercel AI Gateway
GPT-5.5
$11,500
Cheapest tracked route/tier: OpenAI API 0-272K input tokens
Estimated monthly gap: $6,600. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.
Switch friction
- Provider overlap exists on OpenAI API and Vercel AI Gateway; start route-level A/B tests there.
- GPT-5.5 is $16/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
- Provider overlap exists on Vercel AI Gateway and OpenAI API; start route-level A/B tests there.
- GPT-5.2 Codex is $16/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
Specs
| Specification | ||
|---|---|---|
| Released | 2025-12-18 | 2026-04-23 |
| Context window | 400k | 1.05m |
| 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 | 2025-12 |
Pricing and availability
| Pricing attribute | GPT-5.2 Codex | GPT-5.5 |
|---|---|---|
| Input price | $1.75/1M tokens |
|
| Output price | $14/1M tokens |
|
| Providers |
Capabilities
| Capability | GPT-5.2 Codex | GPT-5.5 |
|---|---|---|
| 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 Codex | GPT-5.5 |
|---|---|---|
| SWE-bench Verified | 72.8 | 82.6 |
| SWE-bench Pro | 56.4 | 58.6 |
| Terminal-Bench 2.0 | 64.0 | 82.7 |
Continue comparing
Popular comparisons for GPT-5.2 Codex
Popular comparisons for GPT-5.5
Last reviewed: 2026-06-30. Data sourced from public model cards and provider documentation.