Gemini Robotics-ER 1.6 Preview vs Grok 4.20 Multi-Agent
Too close to call on our weighted score (Gemini Robotics-ER 1.6 Preview 50, Grok 4.20 Multi-Agent 49). The right pick depends on what you value most.
GoogleGemini Robotics-ER 1.6 Preview
50/100- ECI—
- Price$1.00 / $5.00
- Context131K
xAIGrok 4.20 Multi-Agent
49/100- ECI—
- Price$1.25 / $2.50
- Context1M
Add a model
Make it a three-way comparison.
Too close to call
It is close. Our weighted score puts them within a point (Gemini Robotics-ER 1.6 Preview 50/100, Grok 4.20 Multi-Agent 49/100), so choose by what matters most for your work: Grok 4.20 Multi-Agent on price and Grok 4.20 Multi-Agent for long inputs. 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-AgentGrok 4.20 Multi-Agent $1.56 · Gemini Robotics-ER 1.6 Preview $2.00 per 1M tokens (3:1 blend)
- Longest contextGrok 4.20 Multi-AgentGrok 4.20 Multi-Agent 1,000,000 · Gemini Robotics-ER 1.6 Preview 131,072 tokens
- Widest inputsGemini Robotics-ER 1.6 PreviewGemini Robotics-ER 1.6 Preview: Text, Images, Audio, Video · Grok 4.20 Multi-Agent: Text, Images, PDFs
- Self-hostingNo open weightsBoth are available only through APIs
| Measure | Weight | Gemini Robotics-ER 1.6 Preview | Grok 4.20 Multi-Agent |
|---|---|---|---|
| Price | 50% | 36 | 41 |
| Inputs & features | 30% | 90 | 55 |
| Context window | 20% | 24 | 60 |
| Overall | 100% | 50/100 | 49/100 |
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 | Gemini Robotics-ER 1.6 PreviewGoogle | Grok 4.20 Multi-AgentxAI |
|---|---|---|
| Capability | ||
| Capabilities Index (ECI) | — | — |
| ECI rank | — | — |
| Price per million tokens | ||
| Input | $1.00 (best) | $1.25 |
| Output | $5.00 | $2.50 (best) |
| Cached input | — | $0.20 |
| Blended (3:1) | $2.00 | $1.56 (best) |
| Long-context rate | Same rate | Over 200K: $2.50 / $5.00 |
| Price source | Median of 1 providers | Official xAI API |
| Limits | ||
| Context window | 131,072 tokens | 1,000,000 tokens (best) |
| Max output | 65,536 tokens (best) | 30,000 tokens |
| Inputs and features | ||
| Text | Yes | Yes |
| Images | Yes | Yes |
| PDFs | No | Yes |
| Audio | Yes | No |
| Video | Yes | No |
| Reasoning | Yes | Yeslow · medium · high · xhigh |
| Tool calling | Yes | No |
| Structured output | Yes | Yes |
| Availability | ||
| Weights | Proprietary | Proprietary |
| API model ID | — | grok-4.20-multi-agent-0309 |
| API providers | 1 | 1 |
| Released | Apr 14, 2026 | Mar 9, 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.
- Gemini Robotics-ER 1.6 Preview$20.00
- Grok 4.20 Multi-Agent$17.50
Which should you choose?
Which is better: Gemini Robotics-ER 1.6 Preview or Grok 4.20 Multi-Agent?
It is close. Our weighted score puts them within a point (Gemini Robotics-ER 1.6 Preview 50/100, Grok 4.20 Multi-Agent 49/100), so choose by what matters most for your work: Grok 4.20 Multi-Agent on price and Grok 4.20 Multi-Agent for long inputs. 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, Gemini Robotics-ER 1.6 Preview or Grok 4.20 Multi-Agent?
Grok 4.20 Multi-Agent is cheaper at $1.25 input / $2.50 output per million tokens (official xAI API price). Gemini Robotics-ER 1.6 Preview costs $1.00 input / $5.00 output per million tokens (median across 1 API provider). 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 $2.00 for Gemini Robotics-ER 1.6 Preview (1.3× as much).
Which scores higher on benchmarks?
There is no independent benchmark that covers both models yet. Gemini Robotics-ER 1.6 Preview has not been scored yet and Grok 4.20 Multi-Agent has not been scored yet.
Which is better for coding?
There are no published SWE-bench Verified results for Gemini Robotics-ER 1.6 Preview and Grok 4.20 Multi-Agent 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 has the largest context window at 1,000,000 tokens, against 131,072 for Gemini Robotics-ER 1.6 Preview. Maximum output per response: Gemini Robotics-ER 1.6 Preview up to 65,536, Grok 4.20 Multi-Agent up to 30,000 tokens.
Which can read images, PDFs, audio or video?
Gemini Robotics-ER 1.6 Preview accepts text, images, audio and video; Grok 4.20 Multi-Agent accepts text, images and PDFs. Gemini Robotics-ER 1.6 Preview handles the widest range of inputs.
Are any of these open source?
No. Gemini Robotics-ER 1.6 Preview and Grok 4.20 Multi-Agent are proprietary and only available through APIs and apps.
Which is newer?
Gemini Robotics-ER 1.6 Preview is the newest, released Apr 14, 2026. Grok 4.20 Multi-Agent came out Mar 9, 2026. Knowledge cutoff: Gemini Robotics-ER 1.6 Preview 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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