AI Rankings
GPT-6 Astra vs Kimi K3: Scores, Price and Which to Choose
Data updated
Read the model pages for the full picture: GPT-6 Astra and Kimi K3.
Side by side
- GPT-6 Astra
- Kimi K3
- Epoch Capabilities IndexGPT-6 Astra leads
Combined score over many tests. Bar shows where it sits between the lowest and highest score we track.
GPT-6 Astra:Better: 168.8Kimi K3:157.9 - Arena text ratingKimi K3 leads
Rating from head-to-head votes by people. Bar shows where it sits between the lowest and highest score we track.
GPT-6 Astra:1477Kimi K3:Better: 1487 - Arena coding ratingToo close to call
Rating from head-to-head votes by people. Bar shows where it sits between the lowest and highest score we track.
GPT-6 Astra:1543Kimi K3:1539 - Arena web development ratingGPT-6 Astra leads
Rating from head-to-head votes by people. Bar shows where it sits between the lowest and highest score we track.
GPT-6 Astra:Better: 1774Kimi K3:1655 - DeepSWEGPT-6 Astra leads
Software engineering tasks scored as the share solved on the first try (pass@1), run with the open mini-SWE-agent setup.
GPT-6 Astra:Better: 74.1%Kimi K3:68.5% - ARC-AGI-2GPT-6 Astra leads
Visual puzzles where the AI must work out a new rule from a few examples and apply it.
GPT-6 Astra:Better: 95.0%Kimi K3:60.4% - FrontierMath (Tiers 1-3)GPT-6 Astra leads
Original, very hard maths problems written by mathematicians.
GPT-6 Astra:Better: 93.7%Kimi K3:72.2% - GPQA DiamondGPT-6 Astra leads
Very hard multiple-choice science questions in biology, physics and chemistry, written by experts and designed so a quick web search does not give the answer.
GPT-6 Astra:Better: 95.8%Kimi K3:93.1% - OTIS Mock AIMEGPT-6 Astra leads
Maths competition problems in the style of the US AIME exam, from the 2024 and 2025 sets.
GPT-6 Astra:Better: 100.0%Kimi K3:97.2% - SimpleQA VerifiedGPT-6 Astra leads
Short factual questions that each have one correct answer.
GPT-6 Astra:Better: 75.6%Kimi K3:50.6% - Blended price per million tokensKimi K3 costs less
Blended price: lower is better.
GPT-6 Astra:$20.00Kimi K3:Better: $6.00 - Context windowKimi K3 leads
How much text it can read at once.
GPT-6 Astra:922K tokensKimi K3:Better: 1M tokens
The numbers
| Measure | GPT-6 Astra | Kimi K3 |
|---|---|---|
| Epoch Capabilities Index | 168.8 | 157.9 |
| Arena text rating | 1477 | 1487 |
| Arena coding ratingToo close to call | 1543 | 1539 |
| Arena web development rating | 1774 | 1655 |
| DeepSWE | 74.1% | 68.5% |
| ARC-AGI-2 | 95.0% | 60.4% |
| FrontierMath (Tiers 1-3) | 93.7% | 72.2% |
| GPQA Diamond | 95.8% | 93.1% |
| OTIS Mock AIME | 100.0% | 97.2% |
| SimpleQA Verified | 75.6% | 50.6% |
| Blended price per million tokens | $20.00 | $6.00 |
| Context window | 922K tokens | 1M tokens |
What it costs in everyday terms
- 100 chats with GPT-6 Astra
- $3.50
- Blended price $20.00 per million tokens.
- 100 chats with Kimi K3
- $1.05
- Blended price $6.00 per million tokens.
Who should pick which
Pick GPT-6 Astra if these matter most
- Epoch Capabilities Index: 168.8 against 157.9
- Arena web development rating: 1774 against 1655
- DeepSWE: 74.1% against 68.5%
- ARC-AGI-2: 95.0% against 60.4%
- FrontierMath (Tiers 1-3): 93.7% against 72.2%
- GPQA Diamond: 95.8% against 93.1%
- OTIS Mock AIME: 100.0% against 97.2%
- SimpleQA Verified: 75.6% against 50.6%
Pick Kimi K3 if these matter most
- Arena text rating: 1487 against 1477
- Blended price per million tokens: $6.00 against $20.00
- Context window: 1M tokens against 922K tokens
Too close to call: Arena coding rating.
Scores come from tests and votes, not from your own work. Try both on a task you care about before you commit.
Questions about this comparison
- Which is better, GPT-6 Astra or Kimi K3?
- GPT-6 Astra scores higher on 8 of 10 shared quality measures, Kimi K3 on 1. 1 measure is too close to call. Kimi K3 costs about 70% less than GPT-6 Astra on a blended price of $6.00 against $20.00 per million tokens. Which one is better for you depends on your task and budget, so test both on your own work.
- Which is cheaper, GPT-6 Astra or Kimi K3?
- Kimi K3 is cheaper on blended price: $20.00 per million tokens for GPT-6 Astra against $6.00 for Kimi K3. For 100 chats of about 1,000 tokens in and 500 tokens back, that is about $3.50 for GPT-6 Astra and $1.05 for Kimi K3.
- Which is better for coding, GPT-6 Astra or Kimi K3?
- On Arena coding rating they are too close to call (1543 and 1539).
Where this data comes from
- Epoch AI: Benchmark data: Epoch AI, 'Capabilities & benchmarking', epoch.ai/benchmarks (CC BY 4.0). We match models across sources, rank them and show them in charts. Scores are not changed. Epoch AI does not endorse this site.
- Arena (formerly LMArena): Human-preference ratings: Arena (arena.ai) leaderboard dataset, CC BY 4.0. We keep the latest published ratings, match them to models from other sources and rank them. Ratings are not changed. Arena does not endorse this site.
- LiteLLM model price list: Prices and context windows: LiteLLM model price list (github.com/BerriAI/litellm, MIT licence). We use the model maker's own price entry when there is one. Prices change often, so always confirm on the maker's site before you buy.
Newest data on this page: 26 Oct 2026. Prices are list prices and change often, so confirm on the maker's site before you buy. Sponsors never change a score or an order. How we calculate this · Report a mistake