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Claude Fable 5 vs GLM-5.1

Anthropic · released

Wins 6 of 7 areas

Coding · Agents · Reasoning · Facts · Math · Long documents

Z.ai · released

Wins 1 of 7 areas

Following instructions

Claude Fable 5 is the stronger all-rounder.GLM-5.1 is cheaper and better at following instructions.

Scores updated · 35 tests both models report · How we compare

Where each one wins

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

Math, long documents and following instructions rest on a single test each.

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
GLM-5.1$1.38 to read · $4.40 to write$5.78Price from Artificial Analysis

GLM-5.1 costs 90% less for the same work.

The biggest differences

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

Where Claude Fable 5 pulls ahead

  • Unpublished advanced math problemsFrontierMath Tiers 1-3 (v2)+50.2points aheadClaude Fable 587GLM-5.136.8
  • Answers hard knowledge questions correctlyAA-Omniscience · Accuracy+41.7points aheadClaude Fable 565.3GLM-5.123.7
  • Complex command-line tasks across many fieldsTerminal-Bench 4.0+40.4points aheadClaude Fable 542.4GLM-5.12

Where GLM-5.1 pulls ahead

  • Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+33.7points aheadGLM-5.170.1Claude Fable 536.4
  • Follows unfamiliar, precisely checkable instructionsIFBench+12.8points aheadGLM-5.176.3Claude Fable 563.5

Every test, side by side

All 35 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

ReasoningClaude Fable 5

Full reasoning ranking

FactsClaude Fable 5

Full facts ranking

MathClaude Fable 5

Full math ranking

Long documentsClaude Fable 5
  • AA-LCRClaude Fable 5 by 8.682.373.7+8.6

Full long documents ranking

Following instructionsGLM-5.1
  • IFBenchGLM-5.1 by 12.863.576.3+12.8

Full following instructions ranking

Other results13 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 GLM-5.1?

Claude Fable 5 wins six of the seven areas where both have results: coding, agents, reasoning, facts, math and long documents. GLM-5.1 wins following instructions, and costs 90% less.

Which is better for coding?

Claude Fable 5. It wins 7 of the 7 coding tests both models report; GLM-5.1 wins none.

Which is cheaper?

Claude Fable 5 costs $10.00 per million input tokens and $50.00 per million output tokens; GLM-5.1 costs $1.38 and $4.40. That makes GLM-5.1 about 90% cheaper for the same work.

How do you compare the two?

We use the 35 benchmark tests both models have published scores on. The verdict counts the 22 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 13 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 GLM-5.1 with

Z.ai

Across the field

All comparisons