GPT-5.3 Codex vs KAT-Coder-Air V2.5
Benchmarks, API Token Pricing, Context Window & Speed Comparison
Related topics (12)
GPT-5.3 Codex by OpenAI and KAT-Coder-Air V2.5 by Kwaipilot represent two of the frontier AI models analyzed in our comprehensive 2026 AI benchmark and LLM comparison. In this head-to-head evaluation, we examine API token pricing, context window specifications, inference speed (tokens per second), and empirical reasoning performance. From a pure economic perspective, KAT-Coder-Air V2.5 holds a notable pricing advantage for token ingestion. On output generation, KAT-Coder-Air V2.5 is more economical per million generated tokens. In data-heavy architectures requiring extensive repository or document analysis, GPT-5.3 Codex provides an expanded memory horizon with 400K tokens. In latency-sensitive production environments, KAT-Coder-Air V2.5 leads in tokens-per-second throughput, making it ideal for real-time conversational agents and high-concurrency workflows. Below is the complete empirical head-to-head breakdown across cost, speed, context, and capability matrices.
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GPT-5.3 Codex
深度推理模型OpenAI 推出的 GPT-5.3 Codex 人工智能模型，具备 400K 上下文窗口，输入价格为 $2/百万 Token，输出价格为 $16/百万 Token，专为高质量生产环境、推理与自动化工作流打造。
$2.00 / 1M
$16.00 / 1M
400K tokens
79%
KAT-Coder-Air V2.5
深度推理模型Kwaipilot 推出的 KAT-Coder-Air V2.5 人工智能模型，具备 256K 上下文窗口，输入价格为 $0.1/百万 Token，输出价格为 $0.4/百万 Token，专为高质量生产环境、推理与自动化工作流打造。
$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
- 由 OpenAI 研发的高精度 Code-specialised unified reasoning model 架构，支持 400K 上下文窗口
- 极具竞争力的 API 定价（输入 $2/1M，输出 $16/1M），支持高速推理与工具调用
- 在代码生成、逻辑推理与多语言处理基准测试中表现出色
Considerations & Trade-offs
- 超长上下文请求需要规划 Token 成本与并发配额
- 针对特定垂直领域任务建议结合系统提示词与检索增强（RAG）以获得最佳效果
KAT-Coder-Air V2.5 · Strengths & Key Advantages
- 由 Kwaipilot 研发的高精度 Lightweight Code-Generation Transformer 架构，支持 256K 上下文窗口
- 极具竞争力的 API 定价（输入 $0.1/1M，输出 $0.4/1M），支持高速推理与工具调用
- 在代码生成、逻辑推理与多语言处理基准测试中表现出色
Considerations & Trade-offs
- 超长上下文请求需要规划 Token 成本与并发配额
- 针对特定垂直领域任务建议结合系统提示词与检索增强（RAG）以获得最佳效果
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
Verdict & Model Selection Recommendation: Choose GPT-5.3 Codex if your priority is Teams whose default workflow is agent-driven development. Its performance in demanding tasks justifies its operational token cost. Choose KAT-Coder-Air V2.5 if your workflow prioritizes IDE code completions, quick function generation, and automated documentation comments. For large-scale batch processing or customer-facing conversational interfaces, its balance of speed and economics delivers superior ROI.
常见问题 (FAQ)
How does GPT-5.3 Codex compare to KAT-Coder-Air V2.5 in API token pricing and cost per token?+
GPT-5.3 Codex costs $2.00 per 1M input tokens and $16.00 per 1M output tokens, whereas KAT-Coder-Air V2.5 costs $0.10 input and $0.40 output. Overall, KAT-Coder-Air V2.5 is the more cost-effective model for high-volume API pipelines. Both models support prompt caching discounts of up to 90% for repeated prompt prefixes.
Which model has a larger context window: GPT-5.3 Codex or KAT-Coder-Air V2.5?+
GPT-5.3 Codex supports a context window of 400K tokens (~300k words), while KAT-Coder-Air V2.5 supports 256K tokens (~192k words). Therefore, GPT-5.3 Codex can process more textual data and document context in a single prompt.
Which AI model is better for software engineering and coding: GPT-5.3 Codex or KAT-Coder-Air V2.5?+
GPT-5.3 Codex scores 79% on SWE-bench Verified, while KAT-Coder-Air V2.5 scores competitively for software generation. For complex autonomous debugging and agentic engineering, GPT-5.3 Codex provides robust code generation and tool calling.
What is the difference in reasoning capability and extended thinking between GPT-5.3 Codex and KAT-Coder-Air V2.5?+
GPT-5.3 Codex features native chain-of-thought extended thinking mode with configurable reasoning effort. In contrast, KAT-Coder-Air V2.5 provides chain-of-thought reasoning depth for complex math and science.
How does inference speed (tokens per second) compare between GPT-5.3 Codex and KAT-Coder-Air V2.5?+
GPT-5.3 Codex generates approximately 122 tokens per second, while KAT-Coder-Air V2.5 delivers 145 tokens per second. In latency-sensitive production environments, KAT-Coder-Air V2.5 provides faster time-to-first-token (TTFT) and higher streaming response velocity.
Can you implement a tiered LLM routing setup combining GPT-5.3 Codex and KAT-Coder-Air V2.5 to optimize costs?+
Yes! High-efficiency architectures route high-frequency routine classification and conversational tasks to KAT-Coder-Air V2.5 to save operational costs, and dynamically escalate complex architectural queries or reasoning tasks to GPT-5.3 Codex. This tiered routing pattern cuts overall API bills by up to 70%.
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: GetInfoUs Independent AI Benchmarks & Official API Specs