GLM 5.3 vs GPT-6 Astra
API pricing, context window and capabilities for GLM 5.3 and GPT-6 Astra, side by side. Prices are the cheapest listed serving route per 1M tokens, from LiteLLM and OpenRouter.
Verdict
computed from the published numbersGLM 5.3 wins on price. GPT-6 Astra wins on Terminal-Bench, on intelligence and on context window.
Price
GLM 5.3
Terminal-Bench
GPT-6 Astra
Intelligence
GPT-6 Astra
Context window
GPT-6 Astra
Key takeaways
who wins on what, from the published numbersGLM 5.3 wins
- Cheaper input ($0.079 vs $10.00 /1M)
- Cheaper output ($3.08 vs $50.00 /1M)
- Higher max output (1M vs 128K)
- More serving providers (16 vs 5)
GPT-6 Astra wins
- Larger context window (1M vs 1.1M)
- Has web search
Cheaper overall
GLM 5.3
$0.079 + $3.08 /1M
Larger context
GPT-6 Astra
1.1M
More providers
GLM 5.3
16 providers
Pricing & specs
cheapest listed route · per 1M tokensOn-demand listed rates, OpenRouter routed quotes and Vercel reseller quotes. Enterprise commitments can be materially lower. An OpenRouter routed quote is the price of whichever upstream provider OpenRouter prefers today, so it moves day to day.
| GLM 5.3 | GPT-6 Astra | |
|---|---|---|
| Input $/1M | $0.079OpenRouter routed quote best | $10.00via OpenAI |
| Output $/1M | $3.08via Sail best | $50.00via OpenAI |
| Context window | 1M | 1.1M best |
| Max output | 1M best | 128K |
| Serving providers | 16 best | 5 |
| Date | Released Aug 14, 2026 | Released Sep 4, 2026 |
Benchmarks
Benchmark scores, side by side| GLM 5.3 | GPT-6 Astra | |
|---|---|---|
| Intelligence | 44.8 | 52.7 best |
| Terminal-Bench | 84% | 88% best |
| GPQA Diamond | 92% | 96% best |
| Output speed | 62 t/s best | 61 t/s |
| Latency (TTFT) | 3.50s best | 280.05s |
Cost calculator
choose a serving route for each sideInput tokens / month
Output tokens / month
GLM 5.3
via OpenRouter
$5.20
GPT-6 Astra
via OpenAI
$100
Capabilities
feature support, side by side| Feature | GLM 5.3 | GPT-6 Astra |
|---|---|---|
| Vision | ✓ | ✓ |
| Tool use | ✓ | ✓ |
| Reasoning | ✓ | ✓ |
| Audio | — | — |
| Prompt caching | ✓ | ✓ |
| Structured output | ✓ | ✓ |
| Web search | — | ✓ |
Related comparisons
Frequently asked questions
Which is cheaper, GLM 5.3 or GPT-6 Astra?
GLM 5.3 is cheaper for input ($0.079 vs $10.00 per 1M tokens) as an OpenRouter routed quote. GLM 5.3 is cheaper for output ($3.08 vs $50.00 per 1M tokens) from Sail.
What is the context window difference between GLM 5.3 and GPT-6 Astra?
GLM 5.3 has a 1M-token context window and GPT-6 Astra has 1.1M tokens, so GPT-6 Astra can take a larger prompt.
How do GLM 5.3 and GPT-6 Astra compare on benchmarks?
On the tracked benchmarks, GPT-6 Astra leads on Terminal-Bench, and GPT-6 Astra leads on intelligence.
Listed prices from LiteLLM, OpenRouter and Vercel · last checked Oct 14, 2026
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