GLM 5.3 FlashX vs GPT-5.1-Codex
Price, context window & benchmark comparison
VS
Compare different models
Verdict: GLM 5.3 FlashX is 5.8× cheaper than GPT-5.1-Codex on a typical 3:1 input/output mix. GLM 5.3 FlashX has the larger context window (1M vs 400K).
| GLM 5.3 FlashX | GPT-5.1-Codex | |
|---|---|---|
| Input price / 1M | $0.37 | $1.25 |
| Output price / 1M | $1.25 | $10.00 |
| Blended price (3:1) | $0.59 | $3.44 |
| Cached input / 1M | $0.09 | $0.13 |
| Context window | 1M | 400K |
| Max output | 131K | 128K |
| Intelligence index | — | — |
| Coding index | — | — |
| Providers | 1 | — |
| Best provider uptime (30m) | 100.0% | — |
| Vision input | Yes | Yes |
| Reasoning | Yes | Yes |
| Tool calling | Yes | Yes |
| Released | 2026-09-18 | 2025-11-13 |
| Retirement | — | — |
Cost calculator
FAQ
Which is cheaper, GLM 5.3 FlashX or GPT-5.1-Codex?
GLM 5.3 FlashX is 5.8× cheaper than GPT-5.1-Codex on a typical 3:1 input/output mix.
GLM 5.3 FlashX vs GPT-5.1-Codex: which has a bigger context window?
GLM 5.3 FlashX: 1,048,576 tokens. GPT-5.1-Codex: 400,000 tokens.
How much would 1 million requests cost?
At 2,000 input + 500 output tokens per request: GLM 5.3 FlashX ≈ $1,365, GPT-5.1-Codex ≈ $7,500.
More comparisons
GLM 5.3 FlashX vs GLM 5.3 PrimeGLM 5.3 FlashX vs Qwen3.8 Max PrimeGLM 5.3 FlashX vs Command A+GLM 5.3 FlashX vs GPT-6 Luna ProGLM 5.3 FlashX vs GPT-6 LunaGLM 5.3 FlashX vs GPT-6 Sol ProGLM 5.3 FlashX vs GPT-6 SolGLM 5.3 FlashX vs Claude Opus 5.5GLM 5.3 FlashX vs MiMo-V2.6-Pro-UltraSpeedGLM 5.3 FlashX vs MiMo-V2.6-FlashGLM 5.3 FlashX vs Grok 4.7GLM 5.3 FlashX vs Qwen3.8 Omni FlashGLM 5.3 FlashX vs DeepSeek V4.1 FlashGLM 5.3 FlashX vs GPT-6 AstraGLM 5.3 FlashX vs GPT-6 Astra ProGLM 5.3 FlashX vs Qwen3.8 Max (0902)GPT-5.1-Codex vs GLM 5.3 PrimeGPT-5.1-Codex vs Qwen3.8 Max PrimeGPT-5.1-Codex vs Command A+GPT-5.1-Codex vs GPT-6 Luna ProGPT-5.1-Codex vs GPT-6 LunaGPT-5.1-Codex vs GPT-6 Sol ProGPT-5.1-Codex vs GPT-6 SolGPT-5.1-Codex vs Claude Opus 5.5