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Claude Fable 5 vs GPT-5.6 Sol

Anthropic · released

Wins 4 of 8 areas

Coding · Agents · Facts · Images and charts

OpenAI · released

Wins 2 of 8 areas

Reasoning · Long documents

Claude Fable 5 wins more areas, narrowly.GPT-5.6 Sol is cheaper and better at reasoning.

Both rank among the ten best models we track in reasoning, coding, agents and math.

Scores updated · 71 tests both models report · How we compare

Where each one wins

Tests won in each of the eight areas we test. Each piece is one test, so a longer bar means more evidence; grey means the two scored within a point of each other.

Long documents rests on a single test.

What it costs

Prices per million tokens, roughly 750,000 words. The bars show the cost of a million tokens read plus a million written.

Claude Fable 5$10.00 to read · $50.00 to write$60Price from Anthropic's own price page
GPT-5.6 Sol$4.00 to read · $20.00 to write$24Price from Artificial Analysis

GPT-5.6 Sol costs 60% less for the same work.

The biggest differences

The three tests each model wins by the widest margin. Scores are out of 100.

Where Claude Fable 5 pulls ahead

  • Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+28.6points aheadClaude Fable 536.4GPT-5.6 Sol7.8
  • Common-sense trick questionsSimpleBench+17.1points aheadClaude Fable 581.9GPT-5.6 Sol64.8
  • Long, multi-file coding tasks in real codebasesSWE-bench Pro+15.4points aheadClaude Fable 580GPT-5.6 Sol64.6

Where GPT-5.6 Sol pulls ahead

  • Follows unfamiliar, precisely checkable instructionsIFBench+9.2points aheadGPT-5.6 Sol72.7Claude Fable 563.5
  • Customer-service tasks in a simulated bankτ-Bench V3 · Banking+6.2points aheadGPT-5.6 Sol44.3Claude Fable 538.1
  • Research-level physics problemsCritPt+3.7points aheadGPT-5.6 Sol32.3Claude Fable 528.6

Every test, side by side

All 71 tests both models report. The winning score is in its model's colour; marks a score checked independently.

CodingClaude Fable 5

Full coding ranking

AgentsClaude Fable 5

Full agents ranking

ReasoningGPT-5.6 Sol

Full reasoning ranking

FactsClaude Fable 5

Full facts ranking

Images and chartsClaude Fable 5

Full images and charts ranking

MathEven

Full math ranking

Long documentsGPT-5.6 Sol
  • AA-LCRGPT-5.6 Sol by 1.782.384+1.7

Full long documents ranking

Following instructionsEven

Full following instructions ranking

Other results40 tests, not counted

Tests outside the eight areas. They are not counted above: several are summary scores built from other tests, or the same test under another name.

Questions people ask

Which is better, Claude Fable 5 or GPT-5.6 Sol?

Claude Fable 5 wins four of the eight areas we test: coding, agents, facts and images and charts. GPT-5.6 Sol wins reasoning and long documents, and costs 60% less. They are level on math and following instructions.

Which is better for coding?

Claude Fable 5. It wins 4 of the 7 coding tests both models report; GPT-5.6 Sol wins 2, and 1 is a tie.

Which is cheaper?

Claude Fable 5 costs $10.00 per million input tokens and $50.00 per million output tokens; GPT-5.6 Sol costs $4.00 and $20.00. That makes GPT-5.6 Sol about 60% cheaper for the same work.

How do you compare the two?

We use the 71 benchmark tests both models have published scores on. The verdict counts the 31 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 40 are listed but not counted, because several are summary scores or repeat a test. Each score is the one shown on the model's own page.

Compare Claude Fable 5 with

Anthropic

Across the field

Compare GPT-5.6 Sol with

OpenAI

Across the field

All comparisons