GLM 5.3 Flash vs GPT-5.1-Codex-Max
Price, context window & benchmark comparison
VS
Compare different models
Verdict: GLM 5.3 Flash is 69.4× cheaper than GPT-5.1-Codex-Max on a typical 3:1 input/output mix. GLM 5.3 Flash has the larger context window (1M vs 400K).
| GLM 5.3 Flash | GPT-5.1-Codex-Max | |
|---|---|---|
| Input price / 1M | $0.0399 | $1.25 |
| Output price / 1M | $0.0784 | $10.00 |
| Blended price (3:1) | $0.0495 | $3.44 |
| Cached input / 1M | $0.03 | $0.13 |
| Context window | 1M | 400K |
| Max output | 131K | 128K |
| Intelligence index | 27.8 | — |
| Coding index | 71.5 | — |
| Providers | 42 | — |
| Best provider uptime (30m) | 100.0% | — |
| Vision input | Yes | Yes |
| Reasoning | Yes | Yes |
| Tool calling | Yes | Yes |
| Released | 2026-08-26 | 2025-12-04 |
| Retirement | — | — |
Cost calculator
FAQ
Which is cheaper, GLM 5.3 Flash or GPT-5.1-Codex-Max?
GLM 5.3 Flash is 69.4× cheaper than GPT-5.1-Codex-Max on a typical 3:1 input/output mix.
GLM 5.3 Flash vs GPT-5.1-Codex-Max: which has a bigger context window?
GLM 5.3 Flash: 1,048,576 tokens. GPT-5.1-Codex-Max: 400,000 tokens.
How much would 1 million requests cost?
At 2,000 input + 500 output tokens per request: GLM 5.3 Flash ≈ $119.00, GPT-5.1-Codex-Max ≈ $7,500.
More comparisons
GLM 5.3 Flash vs Gemini 4 CarbonGLM 5.3 Flash vs Claude Fable 5.2GLM 5.3 Flash vs Gemini Omni 1.2 FlashGLM 5.3 Flash vs Gemini Omni 1.1 FlashGLM 5.3 Flash vs Hy4GLM 5.3 Flash vs GLM 5.3 FlashX LegalGLM 5.3 Flash vs GPT-6.1 TerraGLM 5.3 Flash vs GPT-6.1 Terra ProGLM 5.3 Flash vs Kimi K3.1 ProGLM 5.3 Flash vs MiniMax M3.1 FlashGLM 5.3 Flash vs DeepSeek V4.1 Flash 1017GLM 5.3 Flash vs Nemotron 3.5 Super VLGLM 5.3 Flash vs Gemini 4 ArgonGLM 5.3 Flash vs Claude Haiku 5.5GLM 5.3 Flash vs Nano Banana 2.1GLM 5.3 Flash vs Mistral Large 4GPT-5.1-Codex-Max vs Gemini 4 CarbonGPT-5.1-Codex-Max vs Claude Fable 5.2GPT-5.1-Codex-Max vs Gemini Omni 1.2 FlashGPT-5.1-Codex-Max vs Gemini Omni 1.1 FlashGPT-5.1-Codex-Max vs Hy4GPT-5.1-Codex-Max vs GLM 5.3 FlashX LegalGPT-5.1-Codex-Max vs GPT-6.1 TerraGPT-5.1-Codex-Max vs GPT-6.1 Terra Pro