GPT-6 Astra vs Kimi K3
API pricing, context window and capabilities for GPT-6 Astra and Kimi K3, side by side. Prices are the cheapest listed serving route per 1M tokens, from LiteLLM and OpenRouter.
Verdict
computed from the published numbersGPT-6 Astra wins on Terminal-Bench, on intelligence and on context window. Kimi K3 wins on price.
Price
Kimi K3
Terminal-Bench
GPT-6 Astra
Intelligence
GPT-6 Astra
Context window
GPT-6 Astra
Key takeaways
who wins on what, from the published numbersGPT-6 Astra wins
- Larger context window (1.1M vs 1M)
- Has web search
Kimi K3 wins
- Cheaper input ($10.00 vs $0.70 /1M)
- Cheaper output ($50.00 vs $12.50 /1M)
- Higher max output (128K vs 1M)
- More serving providers (5 vs 14)
Cheaper overall
Kimi K3
$0.70 + $12.50 /1M
Larger context
GPT-6 Astra
1.1M
More providers
Kimi K3
14 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.
| GPT-6 Astra | Kimi K3 | |
|---|---|---|
| Input $/1M | $10.00via OpenAI | $0.70OpenRouter routed quote best |
| Output $/1M | $50.00via OpenAI | $12.50via Sail best |
| Context window | 1.1M best | 1M |
| Max output | 128K | 1M best |
| Serving providers | 5 | 14 best |
| Date | Released Sep 4, 2026 | Released Jul 16, 2026 |
Benchmarks
Benchmark scores, side by side| GPT-6 Astra | Kimi K3 | |
|---|---|---|
| Intelligence | 52.7 best | 43.6 |
| Terminal-Bench | 88% best | 85% |
| GPQA Diamond | 96% best | 94% |
| Output speed | 61 t/s best | 45 t/s |
| Latency (TTFT) | 280.05s | 3.17s best |
Cost calculator
choose a serving route for each sideInput tokens / month
Output tokens / month
GPT-6 Astra
via OpenAI
$100
Kimi K3
via OpenRouter
$19
Capabilities
feature support, side by side| Feature | GPT-6 Astra | Kimi K3 |
|---|---|---|
| Vision | ✓ | ✓ |
| Tool use | ✓ | ✓ |
| Reasoning | ✓ | ✓ |
| Audio | — | — |
| Prompt caching | ✓ | ✓ |
| Structured output | ✓ | ✓ |
| Web search | ✓ | — |
Related comparisons
Frequently asked questions
Which is cheaper, GPT-6 Astra or Kimi K3?
Kimi K3 is cheaper for input ($10.00 vs $0.70 per 1M tokens) as an OpenRouter routed quote, while Moonshot lists it at $3.00 per 1M input. Kimi K3 is cheaper for output ($50.00 vs $12.50 per 1M tokens) from Sail.
What is the context window difference between GPT-6 Astra and Kimi K3?
GPT-6 Astra has a 1.1M-token context window and Kimi K3 has 1M tokens, so GPT-6 Astra can take a larger prompt.
How do GPT-6 Astra and Kimi K3 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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