o3 vs GLM 5.1
At a Glance
| Compare |  o3OpenAI |  GLM 5.1Z.ai |
|---|---|---|
| Pricing and Limits | ||
| Input priceFrom · USD / 1M tokens | $1.00Openrouter ↗ · Sep 3, 2026 | $1.05Deepinfra ↗ · Sep 23, 2026 |
| Output priceFrom · USD / 1M tokens | $4.00Openrouter ↗ · Sep 3, 2026 | $3.50Deepinfra ↗ · Sep 23, 2026 |
| Context windowMaximum documented tokens | 200K | 203K |
| Model facts checked | Sep 3, 2026View model evidence → | Aug 28, 2026View model evidence → |
Token prices are the lowest available sourced USD rates; input and output may use different providers. Cost ranking estimates output spend on LiveBench, not a full request bill. Ranking methodology →
Available Benchmarks
Side-by-Side Facts
| Field | o3 | GLM-5.1 |
|---|---|---|
| Developer | OpenAI | Z.ai |
| Family | O3 | Glm 5 1 |
| Model | o3 | GLM-5.1 |
| Version | o3 | GLM-5.1 |
| Lifecycle | active | active |
| Released | 2025-04-16 | Unknown |
| Knowledge cutoff | 2024-06-01 | Unknown |
| Input modalities | Text, Image | Text |
| Output modalities | Text | Text |
| Context window | 200K | 203K |
| Total parameters | Unknown | 753.9B |
| Active parameters | Unknown | Unknown |
| License | Unknown | mit |
| Open weights | No | Yes |
| API available | Yes | Yes |
| Self-hostable | No | Yes |
| Provider access | Openai (Standard), Openrouter (Standard) | Deepinfra (Standard), Hugging Face (Standard), Openrouter (Standard), Together Ai (Standard) |
| Capabilities | chat, generation, reasoning, structured_outputs, tools | chat, generation, reasoning, tools |
o3 Capabilities
GLM 5.1 Capabilities
Related Comparisons
All text comparisons →| A | Pair | B | Context |
|---|---|---|---|
GPT-6 AstraOpenAI | vs | o3OpenAI | developer peersimage, text |
Claude Fable 5.1Anthropic | vs | o3OpenAI | cross-developer peersimage, text |
 Gemini 3.1 ProGoogle DeepMind | vs | o3OpenAI | cross-developer peerstext |
 DeepSeek-V4.1-FlashDeepSeek | vs | o3OpenAI | cross-developer peersimage, text |
o3OpenAI | vs | Grok 4.6xAI | cross-developer peersimage, text |
o3OpenAI | vs |  Qwen3.8-MaxQwen | cross-developer peersimage, text |
 Kimi-K3Moonshot AI | vs | o3OpenAI | cross-developer peersimage, text |
 MiniMax-M3MiniMax | vs | o3OpenAI | cross-developer peersimage, text |
o3OpenAI | vs | GLM-5.3Z.ai | cross-developer peerstext |
o3OpenAI | vs |  Hy4 previewTencent | cross-developer peerstext |
Seed 2.1 ProByteDance Seed | vs | o3OpenAI | cross-developer peersimage, text |
 Mistral Large 3Mistral AI | vs | o3OpenAI | cross-developer peersimage, text |
Primary Evidence
Sources and Freshness
Questions
o3 vs GLM 5.1 FAQs
Is o3 or GLM 5.1 better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both o3 and GLM 5.1, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, o3 or GLM 5.1?+
o3 is $1.00 and GLM 5.1 is $1.05 per million tokens, so o3 is cheaper on this metric. o3 is $4.00 and GLM 5.1 is $3.50 per million tokens, so GLM 5.1 is cheaper on this metric.
Which has a larger context window, o3 or GLM 5.1?+
GLM 5.1 has the larger sourced context window. o3 supports 200K and GLM 5.1 supports 203K.
Which performs better in benchmarks, o3 or GLM 5.1?+
There is no overall benchmark winner: At least two independently verified, protocol-matched benchmarks are required for an overall winner.
Can o3 or GLM 5.1 be self-hosted?+
GLM 5.1 is the only model in this pair currently marked as self-hostable. o3 is not marked open weight; GLM 5.1 is open weight.
Can o3 and GLM 5.1 understand images?+
o3 is documented with image input; GLM 5.1 is not documented with image input. This reflects supported input modalities, not vision quality.
Which can generate longer answers, o3 or GLM 5.1?+
Neither has a larger sourced maximum output. o3 is 100K and GLM 5.1 is —.
Do o3 and GLM 5.1 support reasoning and tool use?+
o3: reasoning, tool calling, and image input. GLM 5.1: reasoning and tool calling. Feature support does not establish relative quality.
Which is available from more inference providers, o3 or GLM 5.1?+
o3 has 2 sourced provider routes; GLM 5.1 has 4, so GLM 5.1 has broader tracked availability.
Which offers better value, o3 or GLM 5.1?+
There is no universal value winner. Compare the input and output prices above with the matched benchmark result for your workload: cheaper tokens can be offset by different quality, token usage, latency, or provider availability.