Both models report the same input price at $2 per 1M tokens.
API cost decision in 10 seconds
NewGrok 4.6 vs GPT-5.6 Sol Pro
Pick Grok 4.6 for lower cost; pick GPT-5.6 Sol Pro only if the larger context window matters more.
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Data confirmed:
Prices normalized to USD per 1M tokens
Sample workload: 1M input + 500K output
Budget verdict
Pick Grok 4.6 for lower cost; pick GPT-5.6 Sol Pro only if the larger context window matters more.
On the standard 1M input plus 500K output workload, Grok 4.6 is estimated at $5 vs $7 for GPT-5.6 Sol Pro, saving $2 (28.6% lower).
Cost-first pickGrok 4.6
Context-first pickGPT-5.6 Sol Pro
Sample savings$228.6%
10x traffic gap$20
GPT-5.6 Sol Pro has more context, but Grok 4.6 saves $2 on the standard workload. At 10x that traffic, the same price gap is about $20. Use the calculator below to replace the sample workload with your own token volume.
Cost sensitivity
Workload Sensitivity
Grok 4.6 stays cheaper across input-heavy, balanced, and output-heavy sample workloads.
| Workload shape | Token mix | Better pick | Grok 4.6 | GPT-5.6 Sol Pro |
|---|---|---|---|---|
| Input-heavy / RAG | 5M input + 500K output | Grok 4.6 | $13 | $15 |
| Balanced workload | 1M input + 1M output | Grok 4.6 | $8 | $12 |
| Output-heavy chatbot | 1M input + 5M output | Grok 4.6 | $32 | $52 |
Grok 4.6 is $4 cheaper per 1M output tokens (40% lower; 1.67x difference).
GPT-5.6 Sol Pro has 550K more context (2.1x larger).
Grok 4.6 is $2 cheaper on the standard workload (28.6% 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
both models tie on input price; Grok 4.6 has the lower output price; GPT-5.6 Sol Pro offers the larger context window. For the 1M input plus 500K output sample, Grok 4.6 is cheaper for the standard workload.
For a 1M input token plus 500K output token workload, the estimated API cost is $5 for Grok 4.6 and $7 for GPT-5.6 Sol Pro.
Choose Grok 4.6 when you care most about lower output-token price.
Choose GPT-5.6 Sol Pro when you care most about larger context window.
- On the standard 1M input plus 500K output workload, Grok 4.6 is estimated at $5 vs $7 for GPT-5.6 Sol Pro, saving $2 (28.6% lower).
- Grok 4.6 is $2 cheaper on the standard workload (28.6% lower).
- Both models report the same input price at $2 per 1M tokens.
- Grok 4.6 is $4 cheaper per 1M output tokens (40% lower; 1.67x difference).
- GPT-5.6 Sol Pro has 550K more context (2.1x larger).
| Feature | NewGrok 4.6 (SpaceXAI) | GPT-5.6 Sol Pro (OpenAI) |
|---|---|---|
| Input Price prompt tokens per 1M | $2 | $2 |
| Completion Price per 1M tokens | $6 | $10 |
| Sample Workload Cost 1M input + 500K output | $5 | $7 |
| Context Window | 500K | 1.05M |
| Release Date |
Use-Case Decision Matrix
| Use case | Better pick | Why |
|---|---|---|
| Budget-constrained production | Grok 4.6 | On the standard 1M input plus 500K output workload, Grok 4.6 is estimated at $5 vs $7 for GPT-5.6 Sol Pro, saving $2 (28.6% lower). |
| High-volume input processing | Tie | Lower prompt-token price matters most when prompts, retrieved passages, or documents dominate the bill. |
| Long responses and chatbots | Grok 4.6 | Lower output-token price matters most when assistants generate many completion tokens. |
| RAG or long-document work | GPT-5.6 Sol Pro | A larger context window leaves more room for retrieved passages, conversation history, or source files. |
Related Alternatives
- Grok Build 0.1 can replace Grok 4.6 when lower sample workload cost matters most: $2.
- Grok 4.3 can replace Grok 4.6 when lower sample workload cost matters most: $2.5.
- Grok 4.20 Multi-Agent can replace Grok 4.6 when lower sample workload cost matters most: $2.5.
- Grok 4.20 can replace Grok 4.6 when lower sample workload cost matters most: $2.5.
- Grok 4.20 Multi-Agent offers 2M context with $2.5 sample workload cost.
- Grok 4.20 offers 2M context with $2.5 sample workload cost.
- DeepSeek V4 Flash 0731 offers 1.31M context with $0.17 sample workload cost.
- DeepSeek V4 Flash Latest offers 1.31M context with $0.11 sample workload cost.
- DeepSeek V4 Flash 0731 · DeepSeek · #1
- MiMo-V2.5 · Xiaomi · #2
- Hy3 · Tencent · #3
- Ox Alpha · stealth · #4
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Open OpenAI modelsGrok 4.6 is SpaceXAI's smartest model with frontier performance on coding, knowledge work, and STEM.
GPT-5.6 Sol Pro is the same underlying model as [GPT-5.6 Sol](https://openrouter.ai/openai/gpt-5.6-sol), served with `reasoning.mode` set to `pro` for higher-quality responses on complex tasks. Learn more in OpenAI's docs: https://developers.openai.com/api/docs/guides/reasoning#reasoning-mode