Claude Sonnet 4 vs GLM 5.3 Flash
Price, context window & benchmark comparison
VS
Compare different models
Verdict: GLM 5.3 Flash is 121.2× cheaper than Claude Sonnet 4 on a typical 3:1 input/output mix. GLM 5.3 Flash scores higher on the Artificial Analysis Intelligence Index (27.8 vs 18.9). GLM 5.3 Flash has the larger context window (1M vs 200K).
| Claude Sonnet 4 | GLM 5.3 Flash | |
|---|---|---|
| Input price / 1M | $3.00 | $0.0399 |
| Output price / 1M | $15.00 | $0.0784 |
| Blended price (3:1) | $6.00 | $0.0495 |
| Cached input / 1M | $0.30 | $0.03 |
| Context window | 200K | 1M |
| Max output | 64K | 131K |
| Intelligence index | 18.9 | 27.8 |
| Coding index | 37.6 | 71.5 |
| Providers | — | 42 |
| Best provider uptime (30m) | — | 100.0% |
| Vision input | Yes | Yes |
| Reasoning | Yes | Yes |
| Tool calling | Yes | Yes |
| Released | 2025-05-22 | 2026-08-26 |
| Retirement | 2026-10-15 | — |
Cost calculator
FAQ
Which is cheaper, Claude Sonnet 4 or GLM 5.3 Flash?
GLM 5.3 Flash is 121.2× cheaper than Claude Sonnet 4 on a typical 3:1 input/output mix.
Claude Sonnet 4 vs GLM 5.3 Flash: which has a bigger context window?
Claude Sonnet 4: 200,000 tokens. GLM 5.3 Flash: 1,048,576 tokens.
How much would 1 million requests cost?
At 2,000 input + 500 output tokens per request: Claude Sonnet 4 ≈ $13,500, GLM 5.3 Flash ≈ $119.00.
More comparisons
Claude Sonnet 4 vs Gemini 4 CarbonClaude Sonnet 4 vs Claude Fable 5.2Claude Sonnet 4 vs Gemini Omni 1.2 FlashClaude Sonnet 4 vs Gemini Omni 1.1 FlashClaude Sonnet 4 vs Hy4Claude Sonnet 4 vs GLM 5.3 FlashX LegalClaude Sonnet 4 vs GPT-6.1 TerraClaude Sonnet 4 vs GPT-6.1 Terra ProClaude Sonnet 4 vs Kimi K3.1 ProClaude Sonnet 4 vs MiniMax M3.1 FlashClaude Sonnet 4 vs DeepSeek V4.1 Flash 1017Claude Sonnet 4 vs Nemotron 3.5 Super VLClaude Sonnet 4 vs Gemini 4 ArgonClaude Sonnet 4 vs Claude Haiku 5.5Claude Sonnet 4 vs Nano Banana 2.1Claude Sonnet 4 vs Mistral Large 4GLM 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 Pro