API cost decision in 10 seconds

GPT-5.6 Terra Pro (batch) vs Claude Fable Latest

Pick GPT-5.6 Terra Pro (batch) when budget and context both matter.

Page updated:  Data confirmed:  Prices normalized to USD per 1M tokens Sample workload: 1M input + 500K output

Budget verdict

Pick GPT-5.6 Terra Pro (batch) when budget and context both matter.

On the standard 1M input plus 500K output workload, GPT-5.6 Terra Pro (batch) is estimated at $4 vs $35 for Claude Fable Latest, saving $31 (88.6% lower).

Cost-first pickGPT-5.6 Terra Pro (batch)
Context-first pickGPT-5.6 Terra Pro (batch)
Sample savings$3188.6%
10x traffic gap$310

GPT-5.6 Terra Pro (batch) is cheaper on the standard workload and also has the larger context window. At 10x that traffic, the same price gap is about $310. Use the calculator below to replace the sample workload with your own token volume.

Cost sensitivity

Workload Sensitivity

Same prices, different token mixes.

GPT-5.6 Terra Pro (batch) stays cheaper across input-heavy, balanced, and output-heavy sample workloads.

Workload shapeToken mixBetter pickGPT-5.6 Terra Pro (batch)Claude Fable Latest
Input-heavy / RAG5M input + 500K outputGPT-5.6 Terra Pro (batch)$8$75
Balanced workload1M input + 1M outputGPT-5.6 Terra Pro (batch)$7$60
Output-heavy chatbot1M input + 5M outputGPT-5.6 Terra Pro (batch)$31$260
Cheaper input GPT-5.6 Terra Pro (batch) $1 vs $10 / 1M

GPT-5.6 Terra Pro (batch) is $9 cheaper per 1M input tokens (90% lower; 10x difference).

Cheaper output GPT-5.6 Terra Pro (batch) $6 vs $50 / 1M

GPT-5.6 Terra Pro (batch) is $44 cheaper per 1M output tokens (88% lower; 8.33x difference).

Larger context GPT-5.6 Terra Pro (batch) 1.05M vs 1M

GPT-5.6 Terra Pro (batch) has 50K more context (1.05x larger).

Sample workload GPT-5.6 Terra Pro (batch) $4 vs $35

GPT-5.6 Terra Pro (batch) is $31 cheaper on the standard workload (88.6% lower).

Estimate your workload cost

Your Workload Cost

Prices are normalized to USD per 1M tokens.
GPT-5.6 Terra Pro (batch) Calculating… Estimated API cost
Claude Fable Latest Calculating… Estimated API cost
Cheaper for this workload Calculating… Difference: calculating…

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

Verdict

GPT-5.6 Terra Pro (batch) has the lower input price; GPT-5.6 Terra Pro (batch) has the lower output price; GPT-5.6 Terra Pro (batch) offers the larger context window. For the 1M input plus 500K output sample, GPT-5.6 Terra Pro (batch) is cheaper for the standard workload.

For a 1M input token plus 500K output token workload, the estimated API cost is $4 for GPT-5.6 Terra Pro (batch) and $35 for Claude Fable Latest.

Best Fit

Choose GPT-5.6 Terra Pro (batch) when you care most about lower input-token price, lower output-token price, and larger context window.

Choose Claude Fable Latest when its provider, model quality, latency, or availability is more important than the numeric price/context winner.

Decision Notes
  • On the standard 1M input plus 500K output workload, GPT-5.6 Terra Pro (batch) is estimated at $4 vs $35 for Claude Fable Latest, saving $31 (88.6% lower).
  • GPT-5.6 Terra Pro (batch) is $31 cheaper on the standard workload (88.6% lower).
  • GPT-5.6 Terra Pro (batch) is $9 cheaper per 1M input tokens (90% lower; 10x difference).
  • GPT-5.6 Terra Pro (batch) is $44 cheaper per 1M output tokens (88% lower; 8.33x difference).
  • GPT-5.6 Terra Pro (batch) has 50K more context (1.05x larger).
Head-to-Head Specs
FeatureGPT-5.6 Terra Pro (batch)
(OpenAI)		Claude Fable Latest
(Anthropic)
Input Price
prompt tokens per 1M		$1$10
Completion Price
per 1M tokens		$6$50
Sample Workload Cost
1M input + 500K output		$4$35
Context Window1.05M1M
Release Date

Use-Case Decision Matrix

Use caseBetter pickWhy
Budget-constrained productionGPT-5.6 Terra Pro (batch)On the standard 1M input plus 500K output workload, GPT-5.6 Terra Pro (batch) is estimated at $4 vs $35 for Claude Fable Latest, saving $31 (88.6% lower).
High-volume input processingGPT-5.6 Terra Pro (batch)Lower prompt-token price matters most when prompts, retrieved passages, or documents dominate the bill.
Long responses and chatbotsGPT-5.6 Terra Pro (batch)Lower output-token price matters most when assistants generate many completion tokens.
RAG or long-document workGPT-5.6 Terra Pro (batch)A larger context window leaves more room for retrieved passages, conversation history, or source files.

Related Alternatives

Same-provider lower-cost swaps
  • gpt-oss-120b (free) can replace GPT-5.6 Terra Pro (batch) when lower sample workload cost matters most: $0.
  • gpt-oss-20b (free) can replace GPT-5.6 Terra Pro (batch) when lower sample workload cost matters most: $0.
  • gpt-oss-20b can replace GPT-5.6 Terra Pro (batch) when lower sample workload cost matters most: $0.1.
  • gpt-oss-120b can replace GPT-5.6 Terra Pro (batch) when lower sample workload cost matters most: $0.12.

Cheaper alternatives

Review low-cost models sorted by a standard 1M input plus 500K output workload.

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Larger context alternatives

Find models with larger context windows for RAG, long documents, and codebase review.

Open largest context models

Provider catalogs

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OpenAI catalog

Review all tracked OpenAI models before deciding whether this matchup is the right shortlist.

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Anthropic catalog

Check other Anthropic models with comparable pricing, context, or release timing.

Open Anthropic models
GPT-5.6 Terra Pro (batch)

GPT-5.6 Terra Pro is the same underlying model as [GPT-5.6 Terra](https://openrouter.ai/openai/gpt-5.6-terra), 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

Claude Fable Latest

This model always redirects to the latest model in the Claude Fable family.