Space Bunny Alpha is free for input tokens while Ember-1 costs $3 per 1M tokens.
API cost decision in 10 seconds
NewEmber-1 vs NewSpace Bunny Alpha
Pick Space Bunny Alpha for lower cost; pick Ember-1 only if the larger context window matters more.
Page updated:
Data confirmed:
Prices normalized to USD per 1M tokens
Sample workload: 1M input + 500K output
Budget verdict
Pick Space Bunny Alpha for lower cost; pick Ember-1 only if the larger context window matters more.
On the standard 1M input plus 500K output workload, Space Bunny Alpha is estimated at $0 vs $10.5 for Ember-1, saving $10.5 (100% lower).
Cost-first pickSpace Bunny Alpha
Context-first pickEmber-1
Sample savings$10.5100%
10x traffic gap$105
Ember-1 has more context, but Space Bunny Alpha saves $10.5 on the standard workload. At 10x that traffic, the same price gap is about $105. Use the calculator below to replace the sample workload with your own token volume.
Cost sensitivity
Workload Sensitivity
Space Bunny Alpha stays cheaper across input-heavy, balanced, and output-heavy sample workloads.
| Workload shape | Token mix | Better pick | Ember-1 | Space Bunny Alpha |
|---|---|---|---|---|
| Input-heavy / RAG | 5M input + 500K output | Space Bunny Alpha | $22.5 | $0 |
| Balanced workload | 1M input + 1M output | Space Bunny Alpha | $18 | $0 |
| Output-heavy chatbot | 1M input + 5M output | Space Bunny Alpha | $78 | $0 |
Space Bunny Alpha is free for output tokens while Ember-1 costs $15 per 1M tokens.
Ember-1 has 48.58K more context (1.05x larger).
Space Bunny Alpha is free for the standard workload while the other model is estimated at $10.5.
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
Space Bunny Alpha has the lower input price; Space Bunny Alpha has the lower output price; Ember-1 offers the larger context window. For the 1M input plus 500K output sample, Space Bunny Alpha is cheaper for the standard workload.
For a 1M input token plus 500K output token workload, the estimated API cost is $10.5 for Ember-1 and $0 for Space Bunny Alpha.
Choose Ember-1 when you care most about larger context window.
Choose Space Bunny Alpha when you care most about lower input-token price, and lower output-token price.
- On the standard 1M input plus 500K output workload, Space Bunny Alpha is estimated at $0 vs $10.5 for Ember-1, saving $10.5 (100% lower).
- Space Bunny Alpha is free for the standard workload while the other model is estimated at $10.5.
- Space Bunny Alpha is free for input tokens while Ember-1 costs $3 per 1M tokens.
- Space Bunny Alpha is free for output tokens while Ember-1 costs $15 per 1M tokens.
- Ember-1 has 48.58K more context (1.05x larger).
| Feature | NewEmber-1 (Fireworks) | NewSpace Bunny Alpha (stealth) |
|---|---|---|
| Input Price prompt tokens per 1M | $3 | $0 |
| Completion Price per 1M tokens | $15 | $0 |
| Sample Workload Cost 1M input + 500K output | $10.5 | $0 |
| Context Window | 1.05M | 1M |
| Release Date |
Use-Case Decision Matrix
| Use case | Better pick | Why |
|---|---|---|
| Budget-constrained production | Space Bunny Alpha | On the standard 1M input plus 500K output workload, Space Bunny Alpha is estimated at $0 vs $10.5 for Ember-1, saving $10.5 (100% lower). |
| High-volume input processing | Space Bunny Alpha | Lower prompt-token price matters most when prompts, retrieved passages, or documents dominate the bill. |
| Long responses and chatbots | Space Bunny Alpha | Lower output-token price matters most when assistants generate many completion tokens. |
| RAG or long-document work | Ember-1 | 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.
- 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.
- GLM 5.3 Flash offers 1.31M context with $0.4 sample workload cost.
- DeepSeek V4 Flash 0731 offers 1.31M context with $0.19 sample workload cost.
- MiMo-V2.6-Pro · Xiaomi · #1
- GLM 5.3 Flash · Z.ai · #2
- DeepSeek V4.1 Flash · DeepSeek · #3
- Hy4 preview · Tencent · #4
Cheaper alternatives
Review low-cost models sorted 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 hubsFireworks catalog
Review all tracked Fireworks models before deciding whether this matchup is the right shortlist.
Open Fireworks modelsstealth catalog
Check other stealth models with comparable pricing, context, or release timing.
Open stealth modelsEmber-1 is a specialized reasoning model from Fireworks Research, built on [Kimi K3](https://openrouter.ai/moonshotai/kimi-k3). It is designed to make every token go further: it produces shorter reasoning traces, using roughly 40%...
Space Bunny Alpha is an anonymous large model with blazing-fast inference, strong coding capabilities and native multimodal input support. It delivers adjustable reasoning effort, and a 1M-token context window. Space...