Gemini 3.5 Flash is $0.5 cheaper per 1M input tokens (25% lower; 1.33x difference).
API cost decision in 10 seconds
New🔥Gemini 3.5 Flash vs Grok 4.20 Multi-Agent
Pick Grok 4.20 Multi-Agent when budget and context both matter.
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Data confirmed:
Prices normalized to USD per 1M tokens
Sample workload: 1M input + 500K output
Budget verdict
Pick Grok 4.20 Multi-Agent when budget and context both matter.
On the standard 1M input plus 500K output workload, Grok 4.20 Multi-Agent is estimated at $5 vs $6 for Gemini 3.5 Flash, saving $1 (16.7% lower).
Cost-first pickGrok 4.20 Multi-Agent
Context-first pickGrok 4.20 Multi-Agent
Sample savings$116.7%
10x traffic gap$10
Grok 4.20 Multi-Agent is cheaper on the standard workload and also has the larger context window. At 10x that traffic, the same price gap is about $10. Use the calculator below to replace the sample workload with your own token volume.
Cost sensitivity
Workload Sensitivity
Cost winner changes by workload shape: input-heavy / RAG favors Gemini 3.5 Flash, balanced workload favors Grok 4.20 Multi-Agent, and output-heavy chatbot favors Grok 4.20 Multi-Agent.
| Workload shape | Token mix | Better pick | Gemini 3.5 Flash | Grok 4.20 Multi-Agent |
|---|---|---|---|---|
| Input-heavy / RAG | 5M input + 500K output | Gemini 3.5 Flash | $12 | $13 |
| Balanced workload | 1M input + 1M output | Grok 4.20 Multi-Agent | $10.5 | $8 |
| Output-heavy chatbot | 1M input + 5M output | Grok 4.20 Multi-Agent | $46.5 | $32 |
Grok 4.20 Multi-Agent is $3 cheaper per 1M output tokens (33.3% lower; 1.5x difference).
Grok 4.20 Multi-Agent has 951.42K more context (1.91x larger).
Grok 4.20 Multi-Agent is $1 cheaper on the standard workload (16.7% lower).
Estimate your workload cost
Your Workload Cost
This estimate uses normalized public API pricing per 1M tokens. It is a planning aid, not a billing quote. Verify provider pricing, limits, and terms before production use.
Quick Decision
Gemini 3.5 Flash has the lower input price; Grok 4.20 Multi-Agent has the lower output price; Grok 4.20 Multi-Agent offers the larger context window. For the 1M input plus 500K output sample, Grok 4.20 Multi-Agent is cheaper for the standard workload.
For a 1M input token plus 500K output token workload, the estimated API cost is $6 for Gemini 3.5 Flash and $5 for Grok 4.20 Multi-Agent.
Choose Gemini 3.5 Flash when you care most about lower input-token price.
Choose Grok 4.20 Multi-Agent when you care most about lower output-token price, and larger context window.
- On the standard 1M input plus 500K output workload, Grok 4.20 Multi-Agent is estimated at $5 vs $6 for Gemini 3.5 Flash, saving $1 (16.7% lower).
- Grok 4.20 Multi-Agent is $1 cheaper on the standard workload (16.7% lower).
- Gemini 3.5 Flash is $0.5 cheaper per 1M input tokens (25% lower; 1.33x difference).
- Grok 4.20 Multi-Agent is $3 cheaper per 1M output tokens (33.3% lower; 1.5x difference).
- Grok 4.20 Multi-Agent has 951.42K more context (1.91x larger).
| Feature | New🔥Gemini 3.5 Flash (Google) | Grok 4.20 Multi-Agent (xAI) |
|---|---|---|
| Input Price prompt tokens per 1M | $1.5 | $2 |
| Completion Price per 1M tokens | $9 | $6 |
| Sample Workload Cost 1M input + 500K output | $6 | $5 |
| Context Window | 1.05M | 2M |
| Release Date | ||
| Popularity | #11 |
Use-Case Decision Matrix
| Use case | Better pick | Why |
|---|---|---|
| Budget-constrained production | Grok 4.20 Multi-Agent | On the standard 1M input plus 500K output workload, Grok 4.20 Multi-Agent is estimated at $5 vs $6 for Gemini 3.5 Flash, saving $1 (16.7% lower). |
| High-volume input processing | Gemini 3.5 Flash | Lower prompt-token price matters most when prompts, retrieved passages, or documents dominate the bill. |
| Long responses and chatbots | Grok 4.20 Multi-Agent | Lower output-token price matters most when assistants generate many completion tokens. |
| RAG or long-document work | Grok 4.20 Multi-Agent | A larger context window leaves more room for retrieved passages, conversation history, or source files. |
Related Alternatives
- Gemma 4 26B A4B (free) can replace Gemini 3.5 Flash when lower sample workload cost matters most: $0.
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- Lyria 3 Clip Preview can replace Gemini 3.5 Flash when lower sample workload cost matters most: $0.
- Llama 4 Scout offers 10M context with $0.23 sample workload cost.
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Cheaper alternatives
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Open Google modelsxAI catalog
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Open xAI modelsGemini 3.5 Flash is Google's high-efficiency multimodal model, bringing near-Pro level coding and reasoning at Flash-tier cost and speed. It is highly optimized for coding proficiency and parallel agentic execution...
Grok 4.20 Multi-Agent is a variant of xAI’s Grok 4.20 designed for collaborative, agent-based workflows. Multiple agents operate in parallel to conduct deep research, coordinate tool use, and synthesize information...