Claude Fable 5.1 Xhigh vs GPT-6 Sol Max compared

Claude Fable 5.1 (Xhigh, Default Fallback) from Anthropic and GPT-6 Sol (Max) from OpenAI are both tracked in Franklin AI's benchmark catalogue. The clearest gap is on the bill: Claude Fable 5.1 Xhigh is 5 times the blended price of GPT-6 Sol Max. Everything below is read from the benchmark, price and speed data in Franklin AI's catalogue; nothing here comes from a hands-on test.

Running costs

Claude Fable 5.1 Xhigh lists $10.00 per million input tokens and $50.00 per million output tokens; GPT-6 Sol Max lists $2.00 and $10.00. That makes GPT-6 Sol Max's output 80% cheaper.

A reference job of 1 million input tokens and 200,000 output tokens costs $20.00 with Claude Fable 5.1 Xhigh and $4.00 with GPT-6 Sol Max, so GPT-6 Sol Max saves $16.00. Scale it up to an agent that reads 50 million tokens and writes 5 million in a month and the bill is $750 for Claude Fable 5.1 Xhigh against $150 for GPT-6 Sol Max.

Waiting time

Claude Fable 5.1 Xhigh generates about 61 tokens per second and GPT-6 Sol Max about 127 tokens per second. That makes GPT-6 Sol Max roughly 2.1 times as fast at writing. Before any text appears, Claude Fable 5.1 Xhigh takes 98 seconds and GPT-6 Sol Max 91 seconds. A first-token wait of that length suits background work better than live conversation.

Put together, a 600-token answer would take about 108 seconds from Claude Fable 5.1 Xhigh and 96 seconds from GPT-6 Sol Max, counting the first-token wait.

Overall capability: 5.8 points apart

The catalogue puts Claude Fable 5.1 Xhigh at 50.0 and GPT-6 Sol Max at 44.2 on its intelligence index. That is a clear margin for an index that averages many evaluations. Put another way, GPT-6 Sol Max would need 13% more on this index to draw level.

Among 109 active scored models, Claude Fable 5.1 Xhigh sits 18th and GPT-6 Sol Max 26th.

The catalogue does not yet split either model's score into coding and math indexes.

Value for money

Dividing the blended price by the intelligence index gives a rough cost per point: $0.40 for Claude Fable 5.1 Xhigh and $0.090 for GPT-6 Sol Max, per million tokens. Claude Fable 5.1 Xhigh costs 4.4 times as much per point, which is the price of its lead.

Generation gap

The release dates are September 1, 2026 for Claude Fable 5.1 Xhigh and September 22, 2026 for GPT-6 Sol Max, 21 days apart. They are effectively contemporaries.