GPT-6 Astra vs GLM 5.1
At a Glance
| Compare |  GPT-6 AstraOpenAI |  GLM 5.1Z.ai |
|---|---|---|
| Intelligence, Cost, and Efficiency | ||
| IntelligenceHigher is better · MM Intelligence v2.5 | #6 of 4684.4 score · 3/3 sources · complete | UnrankedNot in the 46-model eligible cohort |
| CostLower is better · Published-token output estimate | #41 of 44$0.520 per LiveBench case | UnrankedNot in the 44-model eligible cohort |
| EfficiencyHigher is better · MM Efficiency v1.5 | #27 of 3849.2 score · 3/3 sources · complete | UnrankedNot in the 38-model eligible cohort |
| Pricing and Limits | ||
| Input priceFrom · USD / 1M tokens | $10.00Openai ↗ · Sep 4, 2026 | $1.05Deepinfra ↗ · Sep 22, 2026 |
| Output priceFrom · USD / 1M tokens | $50.00Openai ↗ · Sep 4, 2026 | $3.50Deepinfra ↗ · Sep 22, 2026 |
| Context windowMaximum documented tokens | 1,050K | 203K |
| Model facts checked | Sep 4, 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
| Benchmark | GPT-6 Astra | GLM-5.1 |
|---|---|---|
| LMArena Text Arenatext-2026-09-13-d25aabda0010 · arena_rating · leader | 1,443.7299% of row best · rating · gpt-6-astra-max; 95% CI [1432.08094427, 1455.36783662]; votes 2693; rank 59 | 1,462.38100% of row best · rating · glm-5.1; 95% CI [1458.52340519, 1466.22702609]; votes 48901; rank 33 |
| Overall ResultCounted from the protocol-matched rows above | 0 benchmark winsNo overall winner | 1 benchmark winNo overall winner |
Third-party benchmark Only like-for-like primary-publisher results are shown; raw scores, relative scores, configuration, and token spend remain visible.
Side-by-Side Facts
| Field | GPT-6 Astra | GLM-5.1 |
|---|---|---|
| Developer | OpenAI | Z.ai |
| Family | Gpt 6 | Glm 5 1 |
| Model | GPT-6 Astra | GLM-5.1 |
| Version | GPT-6 Astra | GLM-5.1 |
| Lifecycle | active | active |
| Released | 2026-09-03 | Unknown |
| Knowledge cutoff | 2026-04-30 | Unknown |
| Input modalities | Text, Image | Text |
| Output modalities | Text | Text |
| Context window | 1,050K | 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, computer-use, generation, reasoning, research, tools | chat, generation, reasoning, tools |
GPT-6 Astra Capabilities
GLM 5.1 Capabilities
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Primary Evidence
Sources and Freshness
Questions
GPT-6 Astra vs GLM 5.1 FAQs
Is GPT-6 Astra or GLM 5.1 better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both GPT-6 Astra and GLM 5.1, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, GPT-6 Astra or GLM 5.1?+
GPT-6 Astra is $10.00 and GLM 5.1 is $1.05 per million tokens, so GLM 5.1 is cheaper on this metric. GPT-6 Astra is $50.00 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, GPT-6 Astra or GLM 5.1?+
GPT-6 Astra has the larger sourced context window. GPT-6 Astra supports 1,050K and GLM 5.1 supports 203K.
Which performs better in benchmarks, GPT-6 Astra 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 GPT-6 Astra or GLM 5.1 be self-hosted?+
GLM 5.1 is the only model in this pair currently marked as self-hostable. GPT-6 Astra is not marked open weight; GLM 5.1 is open weight.
Can GPT-6 Astra and GLM 5.1 understand images?+
GPT-6 Astra 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, GPT-6 Astra or GLM 5.1?+
Neither has a larger sourced maximum output. GPT-6 Astra is 128K and GLM 5.1 is —.
Do GPT-6 Astra and GLM 5.1 support reasoning and tool use?+
GPT-6 Astra: 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, GPT-6 Astra or GLM 5.1?+
GPT-6 Astra has 2 sourced provider routes; GLM 5.1 has 4, so GLM 5.1 has broader tracked availability.
Which offers better value, GPT-6 Astra 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.