Claude Opus 4.8 vs GPT-5 (ChatGPT)
Wins 5 of 5 areas
Coding · Reasoning · Images and charts · Long documents · Following instructions
Wins 0 of 5 areas
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Claude Opus 4.8 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 Opus 4.82 of 2 tests
- ReasoningHard problems that need careful thinking20Claude Opus 4.82 of 2 tests
- Images and chartsUnderstanding pictures, charts and video10Claude Opus 4.81 of 1 test
- Long documentsFinding answers in very long texts10Claude Opus 4.81 of 1 test
- Following instructionsDoing exactly what it is asked10Claude Opus 4.81 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 63% 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 Opus 4.8 pulls ahead
- Hard command-line tasks in a real terminalTerminal-Bench Hard+45.4points ahead
- Very hard expert questions across many subjectsHumanity's Last Exam+42.1points ahead
- Graduate-level biology, physics and chemistry questionsGPQA Diamond+23.4points 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 Opus 4.8
- Terminal-Bench HardClaude Opus 4.8 by 45.458.312.9+45.4
- SciCodeClaude Opus 4.8 by 16.654.437.8+16.6
ReasoningClaude Opus 4.8
- Humanity's Last ExamClaude Opus 4.8 by 42.148.76.6+42.1
- GPQA DiamondClaude Opus 4.8 by 23.49268.6+23.4
Images and chartsClaude Opus 4.8
- LMArena · VisionClaude Opus 4.8 by 63 rating points12951232+63 rating
Following instructionsClaude Opus 4.8
- IFBenchClaude Opus 4.8 by 17.262.245+17.2
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 Opus 4.8 by 94.494.40+94.4
- Artificial Analysis Coding IndexClaude Opus 4.8 by 53.174.321.2+53.1
- AA IntelligenceClaude Opus 4.8 by 31.441.810.4+31.4
Questions people ask
Which is better, Claude Opus 4.8 or GPT-5 (ChatGPT)?
Claude Opus 4.8 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 63% less.
Which is better for coding?
Claude Opus 4.8. It wins 2 of the 2 coding tests both models report; GPT-5 (ChatGPT) wins none.
Which is cheaper?
Claude Opus 4.8 costs $5.00 per million input tokens and $25.00 per million output tokens; GPT-5 (ChatGPT) costs $1.25 and $10.00. That makes GPT-5 (ChatGPT) about 63% 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.