GPT-5.3 Codex vs KAT-Coder-Air V2.5
Benchmarks, API Token Pricing, Context Window & Speed Comparison
Related topics (12)
OpenAI 的 GPT-5.3 Codex 与 Kwaipilot 的 KAT-Coder-Air V2.5 是当前备受关注的两款主力 AI 模型。GPT-5.3 Codex 提供 400K Token 上下文窗口，API 定价为每百万 Token 输入 $2.00 / 输出 $16.00；而 KAT-Coder-Air V2.5 提供 256K Token 上下文窗口，定价为每百万 Token 输入 $0.10 / 输出 $0.40。以下为两者的基准测试、延迟与成本全面对比。
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GPT-5.3 Codex
顶级编程与软件工程OpenAI 推出的 GPT-5.3 Codex 是一款专为自主软件工程、跨文件代码重构与复杂调试打造的旗舰编程大模型，具备 400K 上下文窗口、122 Token/秒生成速度与 72/100 综合智能指数（每百万 Token $2 输入 / $16 输出）。
$2.00 / 1M
$16.00 / 1M
400K tokens
79%
KAT-Coder-Air V2.5
轻量级高性价比模型Kwaipilot 推出的 KAT-Coder-Air V2.5 是一款兼顾极低 API 调用成本与高吞吐效率的轻量级大模型，具备 256K 上下文窗口、145 Token/秒生成速度与 77/100 综合智能指数（每百万 Token $0.1 输入 / $0.4 输出）。
$0.10 / 1M
$0.40 / 1M
256K tokens
N/A
核心差异一览
- KAT-Coder-Air V2.5 is 33.7x cheaper for API usage (input + output tokens combined).
- GPT-5.3 Codex has a larger context window (400K vs 256K tokens).
- KAT-Coder-Air V2.5 is faster at 145 tok/s vs 122 tok/s.
| Feature | GPT-5.3 Codex | KAT-Coder-Air V2.5 |
|---|---|---|
Intelligence Index Composite reasoning & knowledge score (0-100) | 72 | 77 |
Provider | OpenAI | Kwaipilot |
Input Price Cost per million input tokens | $2.00 / 1M | $0.10 / 1M |
Output Price Cost per million output tokens | $16.00 / 1M | $0.40 / 1M |
Blended Price Weighted 7:2:1 cache:input:output per 1M | $2.14 / 1M | $0.07 / 1M |
Context Window Maximum input + output tokens | 400K tokens~600 A4 pages of text | 256K tokens~384 A4 pages of text |
Max Output Tokens Per single request | 128K | 8K |
Throughput Speed Tokens generated per second | 122 tok/s | 145 tok/s |
SWE-bench Verified Real-world software engineering | 79% | N/A |
GPQA Diamond Graduate-level reasoning | 79.2% | N/A |
Cached Input Price Prompt caching discount per 1M tokens | $0.20 / 1M | $0.01 / 1M |
各项指标谁更胜一筹？
At-a-glance decision frameworkEvaluations ongoing
权威基准测试得分对比
Official evaluation metrics verified by independent third-party research labs.
Industry benchmark evaluating real-world GitHub issue resolution and multi-file debugging.
Challenging questions created by domain experts to test complex PhD-level reasoning.
Hardened reasoning and academic knowledge benchmark with reduced lucky-guess probability.
Crowdsourced human preference evaluation based on blind, head-to-head model battles.
Extremely difficult, closed-ended questions spanning the frontier of human expert knowledge.
Autonomous multi-step tasks executed inside a real command-line terminal environment.
Research-grade coding problems drawn from real scientific and numerical workloads.
Contamination-free competitive programming problems collected continuously over time.
American Invitational Mathematics Examination — multi-step Olympiad-level reasoning.
Accuracy when reasoning over very large inputs that fill the model context window.
Tokens emitted per second during active generation streaming.
延迟与响应速度
Time to first token (TTFT) and estimated end-to-end response time for a typical 500-token response.
实时 Token 成本模拟器
Adjust sliders to calculate projected monthly cloud API spending with prompt caching discounts.
GPT-5.3 Codex · Strengths & Key Advantages
- 提供 400K 上下文窗口与最高 128K 输出容量，核心基准表现优异（SWE-bench Verified 79% · GPQA Diamond 79.2%）
- 高达 122 Token/秒的生成吞吐量，首字延迟 (TTFT) 仅约 1230 毫秒
- 极具竞争力的 API 定价（每百万 Token $2 输入 / $16 输出），原生支持提示词缓存、函数调用与结构化 JSON 输出
Considerations & Trade-offs
- 闭源专有云端模型，不支持下载权重进行离线本地物理隔离部署
- 在大规模高频调用场景下，建议结合提示词缓存 (Prompt Caching) 与批量 API 以控制成本
KAT-Coder-Air V2.5 · Strengths & Key Advantages
- 提供 256K 上下文窗口与最高 8K 输出容量，核心基准表现优异（MMLU-Pro 74% · Arena Elo 1285）
- 高达 145 Token/秒的生成吞吐量，首字延迟 (TTFT) 仅约 290 毫秒
- 极具竞争力的 API 定价（每百万 Token $0.1 输入 / $0.4 输出），原生支持提示词缓存、函数调用与结构化 JSON 输出
Considerations & Trade-offs
- 闭源专有云端模型，不支持下载权重进行离线本地物理隔离部署
- 在超长链路的前沿科研推导任务上，深度略逊于顶配重型旗舰推理模型
Token Use & Task Economics
Estimated cost and token consumption to complete one representative agentic task.
| Metric | GPT-5.3 Codex | KAT-Coder-Air V2.5 |
|---|---|---|
Cost per Task Estimated USD to finish one task | $2.60 | $0.03 |
Output Tokens / Task Tokens generated per task | 62K | 14K |
Reasoning Tokens / Task Thinking tokens burned per task | 36K | 1K |
技术规格参数
Architecture, release timeline, capabilities, and modalities.
| Feature | GPT-5.3 Codex | KAT-Coder-Air V2.5 |
|---|---|---|
| Official API Model ID (SDK) | gpt-5-3-codex | kat-coder-air-v2-5 |
| API Protocol | OpenAI Responses API & Chat Completions v1 | Kwaipilot REST API (OpenAI-Compatible) |
| Release Date | 2026-02 | 2026-07 |
| Knowledge Cutoff | November 2025 | April 2026 |
| Architecture | Code-specialised unified reasoning model | Lightweight Code-Generation Transformer |
| Parameters | Confidential | Confidential |
| Enterprise Rate Limits (RPM / TPM) | 10,000 – 30,000 RPM (Tier 5 Enterprise) · 800,000 – 2,000,000 TPM | 5,000 – 15,000 RPM (Production Tier) · 800,000 – 2,000,000 TPM |
| Long-Context Tier (>128K/200K) | Flat rate ($2/1M in) across full 400K window | Flat rate ($0.1/1M in) across full 256K window |
| Prompt Cache Policy & TTL | Automatic prefix caching at $0.2/1M (no extra cache-write fee) | Cached input at $0.01/1M tokens |
| Computer Use / GUI Agent | Supported (Screen coordinate grounding, browser & desktop GUI action loops) | API / CLI Tool-Use & DOM Agent ready (no raw pixel desktop click loop) |
| MCP & Parallel Tool Calling | Native MCP Client/Server ready · Parallel function calling · 100% Strict JSON Schema | Native MCP Client/Server ready · Parallel function calling · 100% Strict JSON Schema |
| Web Search Grounding & Sandbox | Native Web Search tool + Hosted Code Interpreter & File Search RAG | Supported via external Tavily/Exa Search & E2B/Docker Sandbox tools |
| Official Fine-Tuning Support | Supervised Fine-Tuning (SFT), Direct Preference (DPO) & Reinforcement Fine-Tuning (RFT) | API Prompt Engineering & RAG Distillation |
| Multimodal Token Billing | Text BPE (~4 chars/token) · Vision (~258–765 tokens per image tile) | Text BPE (~4 chars/token) |
| Quantization & Min GPU VRAM | Cloud-Hosted Proprietary (FP8 / BF16 Tensor Core Cluster) · Zero Local VRAM Required (100% Serverless Cloud API) | Cloud-Hosted Proprietary (FP8 / BF16 Tensor Core Cluster) · Zero Local VRAM Required (100% Serverless Cloud API) |
| Safety & Frontier Classification | OpenAI Preparedness Framework Audited & System Card Published | Kwaipilot Production Safety & Alignment Verified |
| Enterprise Compliance (ZDR/HIPAA/SOC2) | SOC2 Type II · GDPR · Zero Data Retention (ZDR) & HIPAA BAA Available on Enterprise Tier | SOC2 Type II · GDPR · Zero Data Retention (ZDR) & HIPAA BAA Available on Enterprise Tier |
| Input Modalities | text, vision | text |
| Output Modalities | text | text |
GPT-5.3 Codex vs KAT-Coder-Air V2.5: 常见问题解答 (FAQ)
Which is more intelligent, GPT-5.3 Codex or KAT-Coder-Air V2.5?
KAT-Coder-Air V2.5 is more intelligent. It scores 77 compared with 72 on the composite Intelligence Index.
Which model is faster?
KAT-Coder-Air V2.5 is faster, generating 145 tokens per second compared with 122 tokens per second.
Which model is cheaper to run?
KAT-Coder-Air V2.5 is cheaper at $0.07 per 1M tokens blended, compared with $2.14 (7:2:1 cache:input:output ratio).
Which model has lower latency?
KAT-Coder-Air V2.5 has lower latency, with a time to first token of 0.29s compared with 1.23s.
Which model has a larger context window?
GPT-5.3 Codex has a larger context window, supporting 400K tokens compared with 256K tokens.
综合结论
综合来看，GPT-5.3 Codex（适合：专为自主软件工程、跨文件代码重构与复杂调试打造的旗舰编程任务、企业级 RAG 检索增强生成、自动化智能体工作流与高可靠 API 集成。）与 KAT-Coder-Air V2.5（适合：兼顾极低 API 调用成本与高吞吐效率的轻量级任务、企业级 RAG 检索增强生成、自动化智能体工作流与高可靠 API 集成。）各具优势：KAT-Coder-Air V2.5 在综合智能与编程基准测试中表现更强，KAT-Coder-Air V2.5 拥有更快的 Token 生成速度，而 KAT-Coder-Air V2.5 则在规模化 API 部署中具备更高的成本效益。
常见问题 (FAQ)
在编程和深度推理方面，GPT-5.3 Codex 和 KAT-Coder-Air V2.5 哪个更强？+
在综合智能指数与编程基准评测中，KAT-Coder-Air V2.5 表现占优。建议结合上方的 SWE-bench Verified 与 GPQA Diamond 跑分根据具体场景选择。
GPT-5.3 Codex 与 KAT-Coder-Air V2.5 的 API 价格哪个更便宜？+
GPT-5.3 Codex 的 API 价格为输入 $2.00 / 输出 $16.00（每百万 Token），KAT-Coder-Air V2.5 为输入 $0.10 / 输出 $0.40。综合混合成本来看，KAT-Coder-Air V2.5 更具性价比。
哪款模型拥有更大的上下文窗口和更快的响应速度？+
GPT-5.3 Codex 支持 400K Token 上下文窗口，而 KAT-Coder-Air V2.5 支持 256K Token。在流式生成速度方面，KAT-Coder-Air V2.5 的吞吐表现更快。
Understand key metrics like context window, token pricing, reasoning mode, and SWE-bench scores in our comprehensive AI glossary.
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Benchmark scores, token prices, and rate limits evolve rapidly as AI labs release model updates. Always verify current specifications and pricing on the official provider documentation.
数据来源: OpenAI 与 Kwaipilot 官方 API 文档、模型发布说明及独立基准测试报告 (2026)。