Claude Fable 5 vs GPT-5.6 Sol
Claude Fable 5 and GPT-5.6 Sol occupy the premium frontier at very different prices: Fable 5 scores 62 on the Intelligence Index against Sol's 61, but costs twice as much — $10/$50 versus $5/$30 per million tokens. Both offer 1M-token context and near-identical output speed. Sol is the value play; Fable 5 buys a single measured point.
Side by side
| Claude Fable 5 | GPT-5.6 Sol | |
|---|---|---|
| Maker | Anthropic | OpenAI |
| Released | 2026-06-09 | 2026-07-09 |
| Context window | 1M tokens | 1M tokens |
| Modalities in | text, image | text, image |
| Input $/MTok | $10 | $5 |
| Output $/MTok | $50 | $30 |
| Open weights | No | No |
Benchmark deltas
| Benchmark | Claude Fable 5 | GPT-5.6 Sol | Δ |
|---|---|---|---|
| AA Intelligence Index | 62 | 61 | +1 |
Δ is Claude Fable 5 minus GPT-5.6 Sol, in points. Shaded cell wins the row. Dashed values are vendor-published, not yet reproduced — methodology.
Cost calculator
- Claude Fable 5
- $1,000/mo
- GPT-5.6 Sol
- $550/mo
- Difference
- $450/mo
List prices as of 2026-08-11; excludes caching, batch, and long-context tiers — see model pages for tier notes.
Verdict
One Intelligence Index point separates these models; a doubling of price separates their bills. GPT-5.6 Sol delivers 61 at $5/$30 with the same 1M context and effectively the same speed (68 vs 67 tokens per second). Fable 5's premium is hard to justify on the public numbers alone — its case lives in Anthropic-specific behaviors and the Claude toolchain. Cost-conscious frontier workloads should also price Claude Opus 5, which outscores both and undercuts Fable 5 by half.
Verdicts are analysis, not measurement, and are labeled as such per our editorial policy.
FAQ
- Is Claude Fable 5 cheaper than GPT-5.6 Sol?
- No. GPT-5.6 Sol is cheaper: $5 input / $30 output per million tokens against $10 / $50 for Claude Fable 5 (prices as of August 11, 2026).
- Which has the longer context window — Claude Fable 5 or GPT-5.6 Sol?
- They match: both accept 1M tokens of context.
- Which is the more capable model, Claude Fable 5 or GPT-5.6 Sol?
- Claude Fable 5 scores higher on the Artificial Analysis Intelligence Index: 62 (measured August 11, 2026) against 61 for GPT-5.6 Sol (measured August 11, 2026).
Related news
Comparison published August 11, 2026; underlying data last changed August 11, 2026.