Anthropic: Claude Fable 5 vs OpenAI: gpt-oss-120b
On input price, OpenAI: gpt-oss-120b is ~66.7× cheaper. Verified 2026-10-21.
Verdict
On blended price (3:1 input:output), OpenAI: gpt-oss-120b is ~76.2× cheaper ($0.150/$0.600 vs $10.00/$50.00 per 1M tokens). Anthropic: Claude Fable 5 scores higher on intelligence (62 vs 24, Artificial Analysis) — pay more only if that gap matters for your workload.
Pricing
Per-million-token list prices, verified 2026-10-21. Green marks the better value.
| Metric | Anthropic: Claude Fable 5 | OpenAI: gpt-oss-120b |
|---|---|---|
| Input / 1M | $10.00 | $0.150 |
| Output / 1M | $50.00 | $0.600 |
| Cache read / 1M | $1.00 | $0.075 |
| Blended (3:1) | $20.00/1M | $0.262/1M |
| Estimated monthly cost | Anthropic: Claude Fable 5 | OpenAI: gpt-oss-120b |
|---|---|---|
| Chatbot10,000 reqs · 800/400 tok | $280.00 | $3.60 |
| Coding agent5,000 reqs · 8000/2000 tok | $900.00 | $12.00 |
| RAG pipeline30,000 reqs · 4000/500 tok | $1950.00 | $27.00 |
Plug in your own numbers in the calculator, or paste a real bill into the Bill Shredder.
Specifications & capabilities
| Metric | Anthropic: Claude Fable 5 | OpenAI: gpt-oss-120b |
|---|---|---|
| Context window | 1M | 131K |
| Max output | 128K | 66K |
| Vision input | ✓ | – |
| Tool calling | ✓ | ✓ |
| Reasoning | ✓ | ✓ |
Quality
Intelligence Index by Artificial Analysis (independent evaluations, 0–100).
Sources: Anthropic: Claude Fable 5 on Artificial Analysis · OpenAI: gpt-oss-120b on Artificial Analysis
Performance
Measured by Artificial Analysis on live endpoints.
Speed measurements aren't available for both models yet.
Provider
Infrastructure metrics for the organizations behind these models.
| Metric | Anthropic | OpenAI |
|---|---|---|
| Listed endpoints | 8 | 12 |
| Reliability | 99.8% | 99.9% |
| Avg latency | 520 ms | 450 ms |
| Pricing tiers | standard, batch | standard, batch, provisioned |
Full details: Anthropic: Claude Fable 5 pricing · OpenAI: gpt-oss-120b pricing