Claude Fable Latest is $5 cheaper per 1M input tokens (33.3% lower; 1.5x difference).
API cost decision in 10 seconds
Claude Fable Latest vs GPT-5.5 Pro (batch)
Pick Claude Fable Latest for lower cost; pick GPT-5.5 Pro (batch) 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 Claude Fable Latest for lower cost; pick GPT-5.5 Pro (batch) only if the larger context window matters more.
On the standard 1M input plus 500K output workload, Claude Fable Latest is estimated at $35 vs $60 for GPT-5.5 Pro (batch), saving $25 (41.7% lower).
Cost-first pickClaude Fable Latest
Context-first pickGPT-5.5 Pro (batch)
Sample savings$2541.7%
10x traffic gap$250
GPT-5.5 Pro (batch) has more context, but Claude Fable Latest saves $25 on the standard workload. At 10x that traffic, the same price gap is about $250. Use the calculator below to replace the sample workload with your own token volume.
Cost sensitivity
Workload Sensitivity
Claude Fable Latest stays cheaper across input-heavy, balanced, and output-heavy sample workloads.
| Workload shape | Token mix | Better pick | Claude Fable Latest | GPT-5.5 Pro (batch) |
|---|---|---|---|---|
| Input-heavy / RAG | 5M input + 500K output | Claude Fable Latest | $75 | $120 |
| Balanced workload | 1M input + 1M output | Claude Fable Latest | $60 | $105 |
| Output-heavy chatbot | 1M input + 5M output | Claude Fable Latest | $260 | $465 |
Claude Fable Latest is $40 cheaper per 1M output tokens (44.4% lower; 1.8x difference).
GPT-5.5 Pro (batch) has 50K more context (1.05x larger).
Claude Fable Latest is $25 cheaper on the standard workload (41.7% 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
Claude Fable Latest has the lower input price; Claude Fable Latest has the lower output price; GPT-5.5 Pro (batch) offers the larger context window. For the 1M input plus 500K output sample, Claude Fable Latest is cheaper for the standard workload.
For a 1M input token plus 500K output token workload, the estimated API cost is $35 for Claude Fable Latest and $60 for GPT-5.5 Pro (batch).
Choose Claude Fable Latest when you care most about lower input-token price, and lower output-token price.
Choose GPT-5.5 Pro (batch) when you care most about larger context window.
- On the standard 1M input plus 500K output workload, Claude Fable Latest is estimated at $35 vs $60 for GPT-5.5 Pro (batch), saving $25 (41.7% lower).
- Claude Fable Latest is $25 cheaper on the standard workload (41.7% lower).
- Claude Fable Latest is $5 cheaper per 1M input tokens (33.3% lower; 1.5x difference).
- Claude Fable Latest is $40 cheaper per 1M output tokens (44.4% lower; 1.8x difference).
- GPT-5.5 Pro (batch) has 50K more context (1.05x larger).
| Feature | Claude Fable Latest (Anthropic) | GPT-5.5 Pro (batch) (OpenAI) |
|---|---|---|
| Input Price prompt tokens per 1M | $10 | $15 |
| Completion Price per 1M tokens | $50 | $90 |
| Sample Workload Cost 1M input + 500K output | $35 | $60 |
| Context Window | 1M | 1.05M |
| Release Date |
Use-Case Decision Matrix
| Use case | Better pick | Why |
|---|---|---|
| Budget-constrained production | Claude Fable Latest | On the standard 1M input plus 500K output workload, Claude Fable Latest is estimated at $35 vs $60 for GPT-5.5 Pro (batch), saving $25 (41.7% lower). |
| High-volume input processing | Claude Fable Latest | Lower prompt-token price matters most when prompts, retrieved passages, or documents dominate the bill. |
| Long responses and chatbots | Claude Fable Latest | Lower output-token price matters most when assistants generate many completion tokens. |
| RAG or long-document work | GPT-5.5 Pro (batch) | A larger context window leaves more room for retrieved passages, conversation history, or source files. |
Related Alternatives
- Claude 3 Haiku can replace Claude Fable Latest when lower sample workload cost matters most: $0.88.
- Claude Haiku 4.5 (batch) can replace Claude Fable Latest when lower sample workload cost matters most: $1.75.
- Claude 3.5 Haiku can replace Claude Fable Latest when lower sample workload cost matters most: $2.8.
- Claude Sonnet 5 (batch) can replace Claude Fable Latest when lower sample workload cost matters most: $3.5.
- 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
Cheaper alternatives
Review low-cost models sorted by a standard 1M input plus 500K output workload.
Open cheapest modelsLarger context alternatives
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Open provider hubsAnthropic catalog
Review all tracked Anthropic models before deciding whether this matchup is the right shortlist.
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Open OpenAI modelsThis model always redirects to the latest model in the Claude Fable family.
GPT-5.5 Pro is OpenAI’s high-capability model optimized for deep reasoning and accuracy on complex, high-stakes workloads. It features a 1M+ token context window (922K input, 128K output) with support for...