Input price data is incomplete for one or both models.
API cost decision in 10 seconds
🔥Grok 4.1 Fast vs Grok 4.3
Use the price and context table to shortlist the better API fit; one or both models are missing full workload pricing.
Pricing data updated:
Prices normalized to USD per 1M tokens
Sample workload: 1M input + 500K output
Budget verdict
Use the price and context table to shortlist the better API fit; one or both models are missing full workload pricing.
The standard workload estimate is unavailable because one or both models are missing numeric input or output prices.
Cost-first pickN/A
Context-first pickGrok 4.1 Fast
Sample savingsN/AN/A
10x traffic gapN/A
Context-window winner: Grok 4.1 Fast. Use the custom calculator below when both input and output prices are available.
Output price data is incomplete for one or both models.
Grok 4.1 Fast has 1M more context (2x larger).
The standard workload estimate is unavailable because one or both models are missing numeric prices.
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; both models tie on output price; Grok 4.1 Fast offers the larger context window. For the 1M input plus 500K output sample, the standard workload cost is unavailable.
For a 1M input token plus 500K output token workload, the estimated API cost is N/A for Grok 4.1 Fast and $2.5 for Grok 4.3.
Choose Grok 4.1 Fast when you care most about larger context window.
Choose Grok 4.3 when its provider, model quality, latency, or availability is more important than the numeric price/context winner.
- The standard workload estimate is unavailable because one or both models are missing numeric input or output prices.
- The standard workload estimate is unavailable because one or both models are missing numeric prices.
- Input price data is incomplete for one or both models.
- Output price data is incomplete for one or both models.
- Grok 4.1 Fast has 1M more context (2x larger).
| Feature | 🔥Grok 4.1 Fast (xAI) | Grok 4.3 (xAI) |
|---|---|---|
| Input Price prompt tokens per 1M | Not listed | $1.25 |
| Completion Price per 1M tokens | Not listed | $2.5 |
| Sample Workload Cost 1M input + 500K output | N/A | $2.5 |
| Context Window | 2M | 1M |
| Release Date | N/A | |
| Popularity Rank current rank | #18 | Unranked |
Use-Case Decision Matrix
| Use case | Better pick | Why |
|---|---|---|
| Budget-constrained production | N/A | The standard workload estimate is unavailable because one or both models are missing numeric input or output prices. |
| High-volume input processing | Tie | Lower prompt-token price matters most when prompts, retrieved passages, or documents dominate the bill. |
| Long responses and chatbots | Tie | Lower output-token price matters most when assistants generate many completion tokens. |
| RAG or long-document work | Grok 4.1 Fast | A larger context window leaves more room for retrieved passages, conversation history, or source files. |
Related Alternatives
- No lower-cost same-provider swap is currently tracked for this pair.
- Llama 4 Scout offers 10M context with $0.23 sample workload cost.
- DeepSeek V4 Flash · DeepSeek · #1
- Hy3 preview · Tencent · #2
- Claude Opus 4.7 · Anthropic · #3
- Claude Sonnet 4.6 · Anthropic · #4
Cheaper alternatives
Review low-cost models ranked by a standard 1M input plus 500K output workload.
Open cheapest modelsLarger context alternatives
Find models with larger context windows for RAG, long documents, and codebase review.
Open largest context modelsProvider catalogs
Compare models within provider hubs before choosing a final API vendor.
Open provider hubsxAI catalog
Review all tracked xAI models before deciding whether this matchup is the right shortlist.
Open xAI modelsThis model appears in the model catalog's daily usage rankings, but the models API did not return pricing or context metadata for it. OpenRouter frontend still lists this ranked model, but /api/v1/models currently has no active endpoint or pricing for it. Do not map it to Grok 4.3 because that is a different model.
Grok 4.3 is a reasoning model from xAI. It accepts text and image inputs with text output, and is suited for agentic workflows, instruction-following tasks, and applications requiring high factual...