Claude Fable 5 vs GPT-5 (ChatGPT)
Wins 5 of 5 areas
Coding · Reasoning · Images and charts · Long documents · Following instructions
Wins 0 of 5 areas
—
Claude Fable 5 is the stronger all-rounder.GPT-5 (ChatGPT) is cheaper.
Scores updated · 10 tests both models report · How we compare
Where each one wins
Tests won in each of the five 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.
- CodingWriting and fixing software20Claude Fable 52 of 2 tests
- ReasoningHard problems that need careful thinking20Claude Fable 52 of 2 tests
- Images and chartsUnderstanding pictures, charts and video10Claude Fable 51 of 1 test
- Long documentsFinding answers in very long texts10Claude Fable 51 of 1 test
- Following instructionsDoing exactly what it is asked10Claude Fable 51 of 1 test
Images and charts, 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.
GPT-5 (ChatGPT) costs 81% 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
- Hard command-line tasks in a real terminalTerminal-Bench Hard+50points ahead
- Very hard expert questions across many subjectsHumanity's Last Exam+48.9points ahead
- Graduate-level biology, physics and chemistry questionsGPQA Diamond+24points ahead
Where GPT-5 (ChatGPT) pulls ahead
No clear win on a test scored out of 100.
Every test, side by side
All 10 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingClaude Fable 5
- Terminal-Bench HardClaude Fable 5 by 5062.912.9+50
- SciCodeClaude Fable 5 by 23.26137.8+23.2
ReasoningClaude Fable 5
- Humanity's Last ExamClaude Fable 5 by 48.955.56.6+48.9
- GPQA DiamondClaude Fable 5 by 2492.668.6+24
Images and chartsClaude Fable 5
- LMArena · VisionClaude Fable 5 by 93 rating points13251232+93 rating
Following instructionsClaude Fable 5
- IFBenchClaude Fable 5 by 18.563.545+18.5
Other results3 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.
- τ²-Bench Telecom (AA run)Claude Fable 5 by 98.598.50+98.5
- Artificial Analysis Coding IndexClaude Fable 5 by 55.376.521.2+55.3
- AA IntelligenceClaude Fable 5 by 39.249.610.4+39.2
Questions people ask
Which is better, Claude Fable 5 or GPT-5 (ChatGPT)?
Claude Fable 5 wins all five areas where both have results: coding, reasoning, images and charts, long documents and following instructions. GPT-5 (ChatGPT) wins none, but costs 81% less.
Which is better for coding?
Claude Fable 5. It wins 2 of the 2 coding tests both models report; GPT-5 (ChatGPT) wins none.
Which is cheaper?
Claude Fable 5 costs $10.00 per million input tokens and $50.00 per million output tokens; GPT-5 (ChatGPT) costs $1.25 and $10.00. That makes GPT-5 (ChatGPT) about 81% cheaper for the same work.
How do you compare the two?
We use the 10 benchmark tests both models have published scores on. The verdict counts the 7 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 3 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.