GPT-5.1 vs Kimi K2.7-Code HighSpeed
GPT-5.1 (2025) and Kimi K2.7-Code HighSpeed (2026) compare a standalone API model against a coding-specialized model. GPT-5.1 ships a 262k-token context window, while Kimi K2.7-Code HighSpeed ships a 262k-token context window. On pricing, GPT-5.1 costs $1.25/1M input tokens versus $1.90/1M for the alternative. This page treats the result as workflow and deployment fit, not a universal model winner.
Treat this as a product-type comparison: GPT-5.1 is standalone API model, while Kimi K2.7-Code HighSpeed is coding-specialized model. Choose based on workflow fit before reading any benchmark or price row as decisive.
Decision scorecard
Local evidence first| Signal | GPT-5.1 | Kimi K2.7-Code HighSpeed |
|---|---|---|
| Product type | Standalone API model | Coding-specialized model |
| Best for | reasoning-heavy apps, multimodal apps, and tool-calling agents | custom coding agents, code generation, and tool loops |
| Decision fit | RAG, Agents, and Long context | Coding, RAG, and Agents |
| Context window | 262k | 262k |
| Cheapest output | $10/1M tokens | $8/1M tokens |
| Provider routes | 1 tracked | 1 tracked |
| Shared benchmarks | 0 shared | 0 shared |
Decision tradeoffs
- Local decision data tags GPT-5.1 for RAG, Agents, and Long context.
- Kimi K2.7-Code HighSpeed has the lower cheapest tracked output price at $8/1M tokens.
- 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-5.1
$3,500
Cheapest tracked route/tier: OpenRouter
Kimi K2.7-Code HighSpeed
$3,520
Cheapest tracked route/tier: Moonshot AI Kimi
Estimated monthly gap: $20.00. 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-5.1 and Kimi K2.7-Code HighSpeed; plan for SDK, billing, or endpoint changes.
- Kimi K2.7-Code HighSpeed is $2/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
- No overlapping tracked provider route is sourced for Kimi K2.7-Code HighSpeed and GPT-5.1; plan for SDK, billing, or endpoint changes.
- GPT-5.1 is $2/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
Specs
| Specification | ||
|---|---|---|
| Released | 2025-11-13 | 2026-06-15 |
| Context window | 262k | 262k |
| Parameters | — | 1T |
| Architecture | - | Mixture of Experts |
| License | Proprietary | MITOSI-approved |
| Openness | Proprietary | Open source |
| Commercial use | Commercial use: conditional | Commercial use: permitted |
| Knowledge cutoff | - | - |
Pricing and availability
| Pricing attribute | GPT-5.1 | Kimi K2.7-Code HighSpeed |
|---|---|---|
| Input price | $1.25/1M tokens | $1.90/1M tokens |
| Output price | $10/1M tokens | $8/1M tokens |
| Providers |
Capabilities
| Capability | GPT-5.1 | Kimi K2.7-Code HighSpeed |
|---|---|---|
| Vision | Yes | Yes |
| Multimodal | Yes | Yes |
| Reasoning | Yes | Yes |
| Function calling | Yes | Yes |
| Tool use | Yes | Yes |
| Structured outputs | Yes | Yes |
| Code execution | No | 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 is close: both models cover vision, multimodal input, reasoning mode, function calling, and tool use. That makes context budget, benchmark fit, and provider maturity more important than a simple checklist. If your application depends on one integration detail, verify it against the provider route you plan to use, not just the base model listing.
For cost, GPT-5.1 lists $1.25/1M input and $10/1M 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 $0.15 per million blended tokens. Availability is 1 providers versus 1, so concentration risk also matters.
Choose GPT-5.1 when vision-heavy evaluation 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 has a larger context window, GPT-5.1 or Kimi K2.7-Code HighSpeed?
GPT-5.1 supports 262k tokens, while Kimi K2.7-Code HighSpeed supports 262k 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-5.1 or Kimi K2.7-Code HighSpeed?
Kimi K2.7-Code HighSpeed is cheaper on tracked token pricing. GPT-5.1 costs $1.25/1M input and $10/1M 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-5.1 or Kimi K2.7-Code HighSpeed open source?
GPT-5.1 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-5.1 or Kimi K2.7-Code HighSpeed?
Both GPT-5.1 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-5.1 or Kimi K2.7-Code HighSpeed?
Both GPT-5.1 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. Use this as a quick comparison signal, then confirm the provider-specific limits before committing to production.
Where can I run GPT-5.1 and Kimi K2.7-Code HighSpeed?
GPT-5.1 is available on OpenRouter. 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.