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GPT-5.3 Codex vs GLM-5
A detailed comparison of GPT-5.3 Codex (OpenAI) and GLM-5 (Zhipu AI) across pricing, performance, and features.
Pricing Comparison
| Metric | GPT-5.3 Codex | GLM-5 | Difference |
|---|---|---|---|
| Input / 1M tokens | $2.00 | $1.00 | -50% |
| Output / 1M tokens | $16.00 | $3.20 | -80% |
| Context window | 200K | 200K | — |
| Max output | 65.536K | 128K | — |
Benchmark Comparison
| Benchmark | GPT-5.3 Codex | GLM-5 |
|---|---|---|
| MMLU-Pro | 90% | 70.4% |
| HumanEval | 96.5% | 91% |
| GPQA | 78% | 72% |
Capabilities
| Capability | GPT-5.3 Codex | GLM-5 |
|---|---|---|
| code | ✓ | ✓ |
| reasoning | ✓ | ✓ |
| text | ✓ | ✓ |
| tool-use | ✓ | ✓ |
| vision | ✓ | ✓ |
GPT-5.3 Codex Strengths
- ✓Best coding model from OpenAI
- ✓Large output window (65K tokens)
- ✓Strong reasoning for complex tasks
GPT-5.3 Codex Weaknesses
- ✗API access not yet available
- ✗Premium pricing
GLM-5 Strengths
- ✓Open-weight (MIT license) — self-hostable
- ✓77.8% SWE-Bench Verified — top-tier coding
- ✓128K max output — huge generation window
GLM-5 Weaknesses
- ✗MMLU-Pro lags behind Western flagships
- ✗744B parameters — heavy to self-host
- ✗China-based — availability concerns
Quick Verdict
Best value: GLM-5 is the more affordable option at $1/$3.2 per 1M tokens.
Higher benchmarks: GPT-5.3 Codex scores higher on average across available benchmarks (88.2% avg).
Choose GLM-5 if cost matters most. Choose GPT-5.3 Codex if you need the best possible quality for complex tasks.