Grok 4.20 Multi-Agent vs Grok 4.20 (Reasoning) vs Kimi K2.6
Grok 4.20 (Reasoning) comes out ahead, 56 to 51 and 49 on our weighted score.
xAIGrok 4.20 Multi-Agent
49/100- ECI—
- Price$1.25 / $2.50
- Context1M
- Our pickxAI
Grok 4.20 (Reasoning)
56/100- ECI152.0
- Price$1.25 / $2.50
- Context1M
Moonshot AIKimi K2.6
51/100- ECI151.1
- Price$0.95 / $4.00
- Context262K
Grok 4.20 (Reasoning) is our pick
Grok 4.20 (Reasoning) is the better all-round choice, scoring 56/100 against Kimi K2.6 (51) and Grok 4.20 Multi-Agent (49). The score weighs price 50%, inputs & features 30%, context window 20%. None of the shared benchmarks cover every model here yet, so capability is left out of this verdict.
- CapabilityNot enough dataNo independent benchmark covers every model here yet
- Lowest priceGrok 4.20 Multi-Agent and Grok 4.20 (Reasoning)Grok 4.20 Multi-Agent $1.56 · Grok 4.20 (Reasoning) $1.56 · Kimi K2.6 $1.71 per 1M tokens (3:1 blend)
- Longest contextGrok 4.20 Multi-Agent and Grok 4.20 (Reasoning)Grok 4.20 Multi-Agent 1,000,000 · Grok 4.20 (Reasoning) 1,000,000 · Kimi K2.6 262,144 tokens
- Widest inputsSame inputsGrok 4.20 Multi-Agent: Text, Images, PDFs · Grok 4.20 (Reasoning): Text, Images, PDFs · Kimi K2.6: Text, Images, Video
- Self-hostingKimi K2.6Publishes downloadable weights
| Measure | Weight | Grok 4.20 Multi-Agent | Grok 4.20 (Reasoning) | Kimi K2.6 |
|---|---|---|---|---|
| Price | 50% | 41 | 41 | 39 |
| Inputs & features | 30% | 55 | 80 | 80 |
| Context window | 20% | 60 | 60 | 37 |
| Overall | 100% | 49/100 | 56/100 | 51/100 |
Left out because at least one model lacks the data: capability. The remaining weights were rescaled.
Every spec in one table
Highlighted cells lead their row. Dashes mean the data is not published.
| Specification | Grok 4.20 Multi-AgentxAI | Grok 4.20 (Reasoning)xAI | Kimi K2.6Moonshot AI |
|---|---|---|---|
| Capability | |||
| Capabilities Index (ECI) | — | 152.0 (best) | 151.1 |
| ECI rank | — | #41 of 148 (best) | #45 of 148 |
| GPQA DiamondGraduate-level science questions | — | 89.3% | 90.8% (best) |
| FrontierMath Tiers 1–3Research-level mathematics | — | 44.9% | 57.2% (best) |
| OTIS Mock AIME 2024–2025Competition mathematics | — | 92.2% | 96.1% (best) |
| SWE-bench VerifiedFixing real GitHub issues | — | — | 76.7% |
| SimpleQA VerifiedShort factual questions | — | 30.2% | 34.9% (best) |
| Price per million tokens | |||
| Input | $1.25 | $1.25 | $0.95 (best) |
| Output | $2.50 (best) | $2.50 (best) | $4.00 |
| Cached input | $0.20 | $0.20 | $0.16 (best) |
| Blended (3:1) | $1.56 (best) | $1.56 (best) | $1.71 |
| Long-context rate | Over 200K: $2.50 / $5.00 | Over 200K: $2.50 / $5.00 | Same rate |
| Price source | Official xAI API | Official xAI API | Official Moonshot AI API |
| Limits | |||
| Context window | 1,000,000 tokens (best) | 1,000,000 tokens (best) | 262,144 tokens |
| Max output | 30,000 tokens | 30,000 tokens | 262,144 tokens (best) |
| Inputs and features | |||
| Text | Yes | Yes | Yes |
| Images | Yes | Yes | Yes |
| PDFs | Yes | Yes | No |
| Audio | No | No | No |
| Video | No | No | Yes |
| Reasoning | Yeslow · medium · high · xhigh | Yes | Yes |
| Tool calling | No | Yes | Yes |
| Structured output | Yes | Yes | Yes |
| Availability | |||
| Weights | Proprietary | Proprietary | Open |
| API model ID | grok-4.20-multi-agent-0309 | grok-4.20-0309-reasoning | kimi-k2.6 |
| API providers | 1 | 11 | 46 (best) |
| Released | Mar 9, 2026 | Mar 9, 2026 | Apr 21, 2026 |
| Knowledge cutoff | — | — | Jan 2025 |
What would a month cost?
Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.
- Grok 4.20 Multi-Agent$17.50
- Grok 4.20 (Reasoning)$17.50
- Kimi K2.6$17.50
Which should you choose?
Which is better: Grok 4.20 Multi-Agent, Grok 4.20 (Reasoning) or Kimi K2.6?
Grok 4.20 (Reasoning) is the better all-round choice, scoring 56/100 against Kimi K2.6 (51) and Grok 4.20 Multi-Agent (49). The score weighs price 50%, inputs & features 30%, context window 20%. None of the shared benchmarks cover every model here yet, so capability is left out of this verdict.
Which is cheaper, Grok 4.20 Multi-Agent, Grok 4.20 (Reasoning) or Kimi K2.6?
Grok 4.20 Multi-Agent is cheaper at $1.25 input / $2.50 output per million tokens (official xAI API price). Grok 4.20 (Reasoning) costs $1.25 input / $2.50 output per million tokens (official xAI API price); Kimi K2.6 costs $0.95 input / $4.00 output per million tokens (official Moonshot AI API price). At a typical mix of three input tokens to one output token, that is $1.56 per million tokens for Grok 4.20 Multi-Agent versus $1.56 for Grok 4.20 (Reasoning) (1× as much) and $1.71 for Kimi K2.6 (1.1× as much).
Which scores higher on benchmarks?
There is no independent benchmark that covers all three models yet. Grok 4.20 Multi-Agent has not been scored yet, Grok 4.20 (Reasoning) has an ECI of 152.0 and Kimi K2.6 has an ECI of 151.1.
Which is better for coding?
There are no published SWE-bench Verified results for Grok 4.20 Multi-Agent and Grok 4.20 (Reasoning) yet, so there is no like-for-like coding score. Test both on a sample of your own tasks. Note that Grok 4.20 Multi-Agent does not support tool calling, which most coding agents need.
Which has the bigger context window?
Grok 4.20 Multi-Agent and Grok 4.20 (Reasoning) have the largest context windows (1,000,000 and 1,000,000 tokens), against 262,144 for Kimi K2.6. Maximum output per response: Grok 4.20 Multi-Agent up to 30,000, Grok 4.20 (Reasoning) up to 30,000, Kimi K2.6 up to 262,144 tokens.
Which can read images, PDFs, audio or video?
Grok 4.20 Multi-Agent accepts text, images and PDFs; Grok 4.20 (Reasoning) accepts text, images and PDFs; Kimi K2.6 accepts text, images and video. They handle the same number of input types.
Are any of these open source?
Kimi K2.6 publishes its weights and can be self-hosted; Grok 4.20 Multi-Agent and Grok 4.20 (Reasoning) is proprietary.
Which is newer?
Kimi K2.6 is the newest, released Apr 21, 2026. Grok 4.20 Multi-Agent came out Mar 9, 2026; Grok 4.20 (Reasoning) came out Mar 9, 2026. Knowledge cutoff: Kimi K2.6 Jan 2025.
How do you decide the winner?
Each model gets a 0–100 score on capability (50%, independent benchmark results); price (25%, blended price per million tokens (3 input : 1 output), log scale); inputs & features (15%, image, PDF, audio and video input, tool calling, structured output and reasoning); context window (10%, maximum tokens per request, log scale). Dimensions missing for any model are dropped and the remaining weights rescaled, so every model is judged on the same evidence. Specs and prices come from public model listings and the labs’ own API pages; capability scores come from independent benchmark runs. Data updated Oct 4, 2026.
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