Pricing comparison
Claude Fable 5 vs GPT-5.6 Terra
Per-token pricing, full-workload cost ladders, and monthly volume projections. Numbers sourced directly from each provider's rate card.
Anthropic
Claude Fable 5
- Input
- $10.00 / 1M
- Output
- $50.00 / 1M
- Cached input
- $1.000 / 1M
- Context
- 1M
- Max output
- 128K
OpenAI
GPT-5.6 Terra
- Input
- $2.50 / 1M
- Output
- $15.00 / 1M
- Cached input
- $0.250 / 1M
- Context
- 1.5M
- Max output
- 128K
Cost per request
Four common workload shapes, input tokens and a 1:2 output ratio (a standard chat/completion pattern). Long-context surcharges apply automatically where the provider charges them.
| Scenario | Tokens (in / out) | Claude Fable 5 | GPT-5.6 Terra | Winner |
|---|---|---|---|---|
| Short prompt | 100 / 200 | $0.0110 | $0.0033 | GPT-5.6 Terra |
| Typical request | 1,000 / 2,000 | $0.1100 | $0.0325 | GPT-5.6 Terra |
| Long document | 10,000 / 5,000 | $0.3500 | $0.1000 | GPT-5.6 Terra |
| Large prompt | 100,000 / 10,000 | $1.5000 | $0.4000 | GPT-5.6 Terra |
Monthly bill at scale
Projected monthly cost at typical request volume, assuming the "typical request" shape above (1k in, 2k out).
| Traffic | Req / month | Claude Fable 5 | GPT-5.6 Terra | Delta |
|---|---|---|---|---|
| Small SaaS | 1,000 | $110.00 | $32.50 | GPT-5.6 Terra -$77.50 |
| Growing product | 10,000 | $1,100 | $325.00 | GPT-5.6 Terra -$775.00 |
| Heavy usage | 100,000 | $11,000 | $3,250 | GPT-5.6 Terra -$7,750 |
Which should you use?
For the typical chat-shape request (~1k input, 2k output), GPT-5.6 Terra comes out 238% cheaper. If you're picking one as the default, that's usually the right choice on cost alone.
GPT-5.6 Terra wins on both sides of the bill - cheaper input and cheaper output. If the quality gap is in your favour, there's no cost argument for the other side.
Context window differs: GPT-5.6 Terra holds 1.5M of input vs 1M on the other side. If you regularly push past the smaller ceiling, the comparison ends there.
Live cost calculator
Type in any token counts - both prices update instantly. Uses base input/output rates (no cache discount, no long-context tier).
Claude Fable 5
$0.0350
per request
GPT-5.6 Terra
$0.0100
per request
Try both in the estimator →
Drop your actual prompt in, tokens are counted with the provider's own tokenizer, and the dollar number matches what lands on your invoice.
Frequently asked
- Which is cheaper, Claude Fable 5 or GPT-5.6 Terra?
- On a typical 1,000-input / 2,000-output request, GPT-5.6 Terra costs ~$0.0325 vs ~$0.1100 on Claude Fable 5. Input or output rates can flip the answer for very lopsided workloads - see the cost ladder above.
- What's the difference in per-token pricing?
- Claude Fable 5 charges $10.00 per 1M input tokens and $50.00 per 1M output tokens. GPT-5.6 Terra charges $2.50 / $15.00 per 1M.
- Which has the bigger context window?
- GPT-5.6 Terra is larger (1.5M) vs 1M on the other.
- Is there a cached-input discount on either?
- Claude Fable 5 caches at $1.000 per 1M (90% off). GPT-5.6 Terra caches at $0.250 per 1M (90% off). Workloads with repeated static prefixes see the biggest savings.
- How fresh is this comparison?
- Claude Fable 5 was re-verified on 2026-07-01 and GPT-5.6 Terra on 2026-07-01 against each provider's published rate card. Calcis re-checks every row on a rolling schedule and re-deploys when a provider changes pricing.
Claude Fable 5 verified 2026-07-01 · GPT-5.6 Terra verified 2026-07-01. Rate cards at Anthropic and OpenAI.