Kimi K2.7 Code HighSpeed vs GPT-5.3 Codex
Side-by-side comparison of API pricing, specs, benchmarks, and capabilities
| Specification |
by Moonshot
|
by OpenAI
|
|---|---|---|
| Overview | ||
| Status | Current coding Open weights | Current coding |
| Released | ||
| Pricing per million tokens | ||
| Input | $1.90/Mtok | $1.75/Mtok |
| Output | $8.00/Mtok | $14.00/Mtok |
| Blended avg | $3.42/Mtok | $4.81/Mtok |
| Cached input | $0.380/Mtok | $0.175/Mtok |
| Specifications | ||
| Context window | 262K tokens | 400K tokens |
| Parameters | Proprietary | Proprietary |
| Speed (TPS) | — | — |
| Modalities | ||
| Input |
textimagevideo
|
textimage
|
| Benchmarks sources: Moonshot model card / Vellum LLM Leaderboard | ||
| SWE-Bench Verified | 50 vendor | 85 vendor |
| Avg benchmark score | — | 71 |
| Perf / dollar | — | 14.8 |
| Terminal-Bench 2.1 | — | 77.3 |
| OSWorld-Verified | — | 64.7 |
| HumanEval | 89 vendor | — |
| Independent composite scores each on its own scale — not part of the average above | ||
| AA Intelligence Index | 26.3 | 44.3 |
| AA Agentic Index | 22.5 | — |
| AA-Omniscience Index (−100–100) | -10.2 | — |
| LMSYS Chatbot Arena | — | 1416 ELO |
| Providers | ||
| Available from |
Moonshot — $1.90/$8.00/Mtok
|
OpenAI — $1.75/$14.00/Mtok
|
Cost at scale
1M tokens · 50/50 input/output| Volume | Kimi K2.7 Code HighSpeed | GPT-5.3 Codex | Savings |
|---|---|---|---|
| 1M tokens | $3.43 | $4.81 | $1.39 (28.9%) |
| 10M tokens | $34.25 | $48.13 | $13.88 (28.8%) |
| 100M tokens | $342.5 | $481.25 | $138.75 (28.8%) |
| 1000M tokens | $3425 | $4812.5 | $1387.5 (28.8%) |
When to pick which
distilled from the pricing and spec data above- cost dominates: $3.42/Mtok blended vs $4.81 — 28.8% less on the same 50/50 token mix
- you want open weights — self-host it, fine-tune it, or exit the API entirely; GPT-5.3 Codex is closed
- your workload re-reads context (agents, RAG, long chats): cached input costs $0.175/Mtok — 90% off its list input price
- you need the longer context: 400K tokens vs 262K (1.5×)
The cheaper option here — Kimi K2.7 Code HighSpeed costs $3.42/Mtok blended on Moonshot.
Summary
Kimi K2.7 Code HighSpeed by Moonshot costs $1.90/Mtok input and $8.00/Mtok output, with a 262K-token context window. It supports text, image, video input.
GPT-5.3 Codex by OpenAI costs $1.75/Mtok input and $14.00/Mtok output, with a 400K-token context window. It supports text, image input.
On a blended cost basis, Kimi K2.7 Code HighSpeed is 28.8% cheaper than GPT-5.3 Codex.
The two aren't directly comparable on average benchmark score: GPT-5.3 Codex has published per-benchmark results, while Kimi K2.7 Code HighSpeed does not yet — it is measured today on independent composites (see the table above).
Note: Pricing is per million tokens. Actual costs vary with usage patterns, prompt caching, and batch discounts. Always verify against official provider pricing pages.