GPT-5.2 Codex vs Kimi K2.7-Code HighSpeed
GPT-5.2 Codex (2025) and Kimi K2.7-Code HighSpeed (2026) are agentic coding models from OpenAI and Moonshot AI. GPT-5.2 Codex ships a not-yet-sourced context window, while Kimi K2.7-Code HighSpeed ships a 262k-token context window. On pricing, GPT-5.2 Codex costs $1.75/1M input tokens versus $1.90/1M 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.
Kimi K2.7-Code HighSpeed is safer overall; choose GPT-5.2 Codex when coding workflow support matters.
Decision scorecard
Local evidence first| Signal | GPT-5.2 Codex | Kimi K2.7-Code HighSpeed |
|---|---|---|
| Best for | custom coding agents, code generation, and tool loops | custom coding agents, code generation, and tool loops |
| Decision fit | Coding, Agents, and Vision | Coding, RAG, and Agents |
| Context window | — | 262k |
| Cheapest output | $14/1M tokens | $8/1M tokens |
| Provider routes | 1 tracked | 1 tracked |
| Shared benchmarks | 0 shared | 0 shared |
Decision tradeoffs
- GPT-5.2 Codex uniquely exposes Code execution in local model data.
- Local decision data tags GPT-5.2 Codex for Coding, Agents, and Vision.
- Kimi K2.7-Code HighSpeed has the larger context window for long prompts, retrieval packs, or transcript analysis.
- Kimi K2.7-Code HighSpeed has the lower cheapest tracked output price at $8/1M tokens.
- Kimi K2.7-Code HighSpeed uniquely exposes Structured outputs in local model data.
- Local decision data tags Kimi K2.7-Code HighSpeed 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
Kimi K2.7-Code HighSpeed
$3,520
Cheapest tracked route/tier: Moonshot AI Kimi
Estimated monthly gap: $1,380. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.
Switch friction
- No overlapping tracked provider route is sourced for GPT-5.2 Codex and Kimi K2.7-Code HighSpeed; plan for SDK, billing, or endpoint changes.
- Kimi K2.7-Code HighSpeed is $6/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
- Check replacement coverage for Code execution before moving production traffic.
- Kimi K2.7-Code HighSpeed adds Structured outputs in local capability data.
- No overlapping tracked provider route is sourced for Kimi K2.7-Code HighSpeed and GPT-5.2 Codex; plan for SDK, billing, or endpoint changes.
- GPT-5.2 Codex is $6/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
- Check replacement coverage for Structured outputs before moving production traffic.
- GPT-5.2 Codex adds Code execution in local capability data.
Specs
| Specification | ||
|---|---|---|
| Released | 2025-12-18 | 2026-06-15 |
| Context window | — | 262k |
| Parameters | — | 1T |
| Architecture | Decoder Only | Mixture of Experts |
| License | Proprietary | MITOSI-approved |
| Openness | Proprietary | Open source |
| Commercial use | Commercial use: conditional | Commercial use: permitted |
| Knowledge cutoff | 2025-08 | - |
Pricing and availability
| Pricing attribute | GPT-5.2 Codex | Kimi K2.7-Code HighSpeed |
|---|---|---|
| Input price | $1.75/1M tokens | $1.90/1M tokens |
| Output price | $14/1M tokens | $8/1M tokens |
| Providers |
Capabilities
| Capability | GPT-5.2 Codex | Kimi K2.7-Code HighSpeed |
|---|---|---|
| Vision | Yes | Yes |
| Multimodal | Yes | Yes |
| Reasoning | Yes | Yes |
| Function calling | Yes | Yes |
| Tool use | Yes | Yes |
| Structured outputs | No | Yes |
| Code execution | Yes | No |
| IDE integration | No | No |
| Computer use | No | No |
| Parallel agents | No | No |
Benchmarks
No shared benchmark scores are currently available for this pair.
Deep dive
The capability footprint differs most on structured outputs: Kimi K2.7-Code HighSpeed and code execution: GPT-5.2 Codex. Both models share vision, multimodal input, reasoning mode, and function calling, 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-5.2 Codex lists $1.75/1M input and $14/1M output tokens on the cheapest tracked provider, while Kimi K2.7-Code HighSpeed lists $1.90/1M input and $8/1M output tokens on the cheapest tracked provider. A 70/30 input-output blend puts Kimi K2.7-Code HighSpeed lower by about $1.70 per million blended tokens. Availability is 1 providers versus 1, so concentration risk also matters.
Choose GPT-5.2 Codex when coding workflow support and lower input-token cost are central to the workload. Choose Kimi K2.7-Code HighSpeed when coding workflow support are more important. For production, rerun your own prompts through the exact provider, region, and tool stack you plan to ship. This keeps the decision grounded in measurable tradeoffs instead of brand-level assumptions. It also helps separate model capability from provider packaging, which can change cost and latency.
FAQ
Which is cheaper, GPT-5.2 Codex or Kimi K2.7-Code HighSpeed?
Kimi K2.7-Code HighSpeed is cheaper on tracked token pricing. GPT-5.2 Codex costs $1.75/1M input and $14/1M output tokens. Kimi K2.7-Code HighSpeed costs $1.90/1M input and $8/1M output tokens. Provider discounts or batch pricing can still change the final bill.
Is GPT-5.2 Codex or Kimi K2.7-Code HighSpeed open source?
GPT-5.2 Codex is listed under Proprietary. Kimi K2.7-Code HighSpeed is listed under MIT. 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-5.2 Codex or Kimi K2.7-Code HighSpeed?
Both GPT-5.2 Codex and Kimi K2.7-Code HighSpeed expose vision. 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 multimodal input, GPT-5.2 Codex or Kimi K2.7-Code HighSpeed?
Both GPT-5.2 Codex and Kimi K2.7-Code HighSpeed expose multimodal input. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface.
Which is better for reasoning mode, GPT-5.2 Codex or Kimi K2.7-Code HighSpeed?
Both GPT-5.2 Codex and Kimi K2.7-Code HighSpeed expose reasoning mode. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface.
Where can I run GPT-5.2 Codex and Kimi K2.7-Code HighSpeed?
GPT-5.2 Codex is available on Vercel AI Gateway. Kimi K2.7-Code HighSpeed is available on Moonshot AI Kimi. Provider coverage can affect latency, region availability, compliance posture, and fallback options. Use this as a quick comparison signal, then confirm the provider-specific limits before committing to production.
Continue comparing
Last reviewed: 2026-06-22. Data sourced from public model cards and provider documentation.