GLM 5.3 Flash vs o3 Pro
Price, context window & benchmark comparison
VS
Compare different models
Verdict: GLM 5.3 Flash is 706.7× cheaper than o3 Pro on a typical 3:1 input/output mix. GLM 5.3 Flash has the larger context window (1M vs 200K).
| GLM 5.3 Flash | o3 Pro | |
|---|---|---|
| Input price / 1M | $0.0399 | $20.00 |
| Output price / 1M | $0.0784 | $80.00 |
| Blended price (3:1) | $0.0495 | $35.00 |
| Cached input / 1M | $0.03 | — |
| Context window | 1M | 200K |
| Max output | 131K | 100K |
| 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 | 2025-06-10 |
| Retirement | — | 2026-12-11 |
Cost calculator
FAQ
Which is cheaper, GLM 5.3 Flash or o3 Pro?
GLM 5.3 Flash is 706.7× cheaper than o3 Pro on a typical 3:1 input/output mix.
GLM 5.3 Flash vs o3 Pro: which has a bigger context window?
GLM 5.3 Flash: 1,048,576 tokens. o3 Pro: 200,000 tokens.
How much would 1 million requests cost?
At 2,000 input + 500 output tokens per request: GLM 5.3 Flash ≈ $119.00, o3 Pro ≈ $80,000.
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 4o3 Pro vs Gemini 4 Carbono3 Pro vs Claude Fable 5.2o3 Pro vs Gemini Omni 1.2 Flasho3 Pro vs Gemini Omni 1.1 Flasho3 Pro vs Hy4o3 Pro vs GLM 5.3 FlashX Legalo3 Pro vs GPT-6.1 Terrao3 Pro vs GPT-6.1 Terra Pro