LLMCost

Anthropic: Claude Fable 5 vs OpenAI: GPT-5.6 Terra Pro

On input price, OpenAI: GPT-5.6 Terra Pro is ~5.0× cheaper. Verified 2026-10-21.

Anthropic: Claude Fable 5 $10.00/$50.00vsOpenAI: GPT-5.6 Terra Pro $2.00/$12.00

Verdict

On blended price (3:1 input:output), OpenAI: GPT-5.6 Terra Pro is ~4.4× cheaper ($2.00/$12.00 vs $10.00/$50.00 per 1M tokens). Anthropic: Claude Fable 5 scores higher on intelligence (62 vs 57, Artificial Analysis) — pay more only if that gap matters for your workload. Anthropic: Claude Fable 5 generates 13% faster output.

Pricing

Per-million-token list prices, verified 2026-10-21. Green marks the better value.

MetricAnthropic: Claude Fable 5OpenAI: GPT-5.6 Terra Pro
Input / 1M$10.00$2.00
Output / 1M$50.00$12.00
Cache read / 1M$1.00$0.200
Blended (3:1)$20.00/1M$4.50/1M
Estimated monthly costAnthropic: Claude Fable 5OpenAI: GPT-5.6 Terra Pro
Chatbot10,000 reqs · 800/400 tok$280.00$64.00
Coding agent5,000 reqs · 8000/2000 tok$900.00$200.00
RAG pipeline30,000 reqs · 4000/500 tok$1950.00$420.00

Plug in your own numbers in the calculator, or paste a real bill into the Bill Shredder.

Specifications & capabilities

MetricAnthropic: Claude Fable 5OpenAI: GPT-5.6 Terra Pro
Context window1M1.1M
Max output128K128K
Vision input✓✓
Tool calling✓✓
Reasoning✓✓

Quality

Intelligence Index by Artificial Analysis (independent evaluations, 0–100).

Intelligence Index — higher is better
Anthropic: Claude Fable 562
OpenAI: GPT-5.6 Terra Pro57

Sources: Anthropic: Claude Fable 5 on Artificial Analysis · OpenAI: GPT-5.6 Terra Pro on Artificial Analysis

Performance

Measured by Artificial Analysis on live endpoints.

Output speed — higher is better
Anthropic: Claude Fable 590 tok/s
OpenAI: GPT-5.6 Terra Pro80 tok/s
Latency (TTFT) — lower is better
Anthropic: Claude Fable 51,100 ms
OpenAI: GPT-5.6 Terra Pro1,300 ms
MetricAnthropic: Claude Fable 5OpenAI: GPT-5.6 Terra Pro
Cost per task$0.000022$0.000016

Provider

Infrastructure metrics for the organizations behind these models.

MetricAnthropicOpenAI
Listed endpoints812
Reliability99.8%99.9%
Avg latency520 ms450 ms
Pricing tiersstandard, batchstandard, batch, provisioned

Full details: Anthropic: Claude Fable 5 pricing · OpenAI: GPT-5.6 Terra Pro pricing