// head_to_head
GPT-6 Astra vs GLM 5.3 FlashX
Published LiveBench scores across all seven categories, live list pricing, context windows, and the measured cost of a point of capability — for both models, side by side.
GLM 5.3 FlashX is the cheaper of the two; neither can be ranked on quality here.
GLM 5.3 FlashX does not have a published LiveBench run, so this comparison covers price, context and declared capabilities only. A missing score means "not evaluated", not "worse" — the right way to separate these two is an eval on your own workload.
openai
GPT-6 Astra
- Blended / 1M
- $20.00
- Context
- 1.1M
- Released
- Sep 4, 2026
- Overall score
- 82.2
z-ai
GLM 5.3 FlashX
- Blended / 1M
- $0.590
- Context
- 1.0M
- Released
- Sep 18, 2026
- Overall score
- Not evaluated
Specs and pricing
| Metric | GPT-6 Astra | GLM 5.3 FlashX |
|---|---|---|
| LiveBench overall Mean of the seven LiveBench category scores, 0–100. Higher is better. | 82.2 | — |
| Cost per point Measured benchmark spend divided by overall score — dollars per point of capability. | $0.3942 | — |
| Blended price / 1M 3:1 input:output mix, the usual shape of production traffic. | $20.00 | $0.590win |
| Input price / 1M | $10.00 | $0.370win |
| Output price / 1M | $50.00 | $1.25win |
| Cached input / 1M Price of an input token served from the prompt cache, where the provider publishes one. | $1.00 | $0.075win |
| Context window | 1.1M | 1.0M |
| Max output tokens | 128K | 131K |
Benchmarks by category
An overall score averages away the thing you probably care about. These are the seven LiveBench categories scored separately — GPT-6 Astra on top, GLM 5.3 FlashX below, both out of 100.
What each one costs to run
Per-token prices are hard to feel. These are monthly list costs for both models across five workload shapes, using each provider's published cached-input rate where there is one.
| Workload | GPT-6 Astra | GLM 5.3 FlashX |
|---|---|---|
| Support chatbot 1.2K in / 400 out × 200K requests | $5,752/mo | $167.56/mo |
| RAG assistant 8K in / 600 out × 100K requests | $7,400/mo | $253.00/mo |
| Coding agent 40K in / 4K out × 20K requests | $6,960/mo | $230.80/mo |
| Document extraction 20K in / 1.5K out × 50K requests | $13,300/mo | $449.00/mo |
| Bulk classification 500 in / 20 out × 5M requests | $25,500/mo | $902.50/mo |
Which should you pick?
You are cost-constrained
GLM 5.3 FlashX
Cheaper on blended list price at $0.590 per million tokens.
GPT-6 Astra vs GLM 5.3 FlashX FAQ
Which is better, GPT-6 Astra or GLM 5.3 FlashX?
GLM 5.3 FlashX is the cheaper of the two; neither can be ranked on quality here. GLM 5.3 FlashX does not have a published LiveBench run, so this comparison covers price, context and declared capabilities only. A missing score means "not evaluated", not "worse" — the right way to separate these two is an eval on your own workload.
Is GPT-6 Astra cheaper than GLM 5.3 FlashX?
GLM 5.3 FlashX is cheaper. On a 3:1 input:output blend, GPT-6 Astra lists at $20.00 per million tokens and GLM 5.3 FlashX at $0.590 — GLM 5.3 FlashX is 34× cheaper. Input and output are priced separately — GPT-6 Astra charges $10.00 in and $50.00 out, GLM 5.3 FlashX charges $0.370 and $1.25 — so the model that looks cheaper flips depending on how output-heavy your workload is.
Does GPT-6 Astra or GLM 5.3 FlashX have a bigger context window?
They are effectively the same — 1.1M for GPT-6 Astra and 1.0M for GLM 5.3 FlashX.
Do GPT-6 Astra and GLM 5.3 FlashX support prompt caching?
Both publish a cached-input rate: $1.00 per million for GPT-6 Astra and $0.075 for GLM 5.3 FlashX, against full input rates of $10.00 and $0.370. On a workload with a long stable prefix — a system prompt, a tool schema, a retrieved corpus — that changes the economics more than the headline price does.
Related comparisons
How these numbers are produced
- Price — provider list price from OpenRouter, refreshed every 15 minutes. “Blended” is a 3:1 input:output mix.
- Scores — LiveBench release 2026-06-25, using their own category map. Each model shows its strongest published run. A blank means “not evaluated”, never “bad”.
- Cost per point — the measured dollars LiveBench spent on the run, divided by the score it earned.
- “Win” — awarded only past a threshold: one full point on a benchmark score, 10% on a price, 25% on a context window. Anything tighter reports as a tie, because effort settings alone move a LiveBench score by more than that.
Published benchmarks rank models on someone else's tasks. Before committing, see LLM & agent evaluation for building an eval on your own.