Claude Opus 4.5 vs Claude Opus 4.8
Wins 0 of 8 areas
—
Wins 7 of 8 areas
Coding · Agents · Reasoning · Facts · Images and charts · Math · Following instructions
Claude Opus 4.8 is the stronger all-rounder.
Scores updated · 49 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.
- CodingWriting and fixing software08Claude Opus 4.88 of 8 tests
- MathCompetition and research-level math05Claude Opus 4.85 of 6 tests · 1 tie
- ReasoningHard problems that need careful thinking05Claude Opus 4.85 of 5 tests
- AgentsCarrying out multi-step tasks on its own03Claude Opus 4.83 of 4 tests · 1 tie
- FactsGetting facts right instead of making them up03Claude Opus 4.83 of 3 tests
- Following instructionsDoing exactly what it is asked02Claude Opus 4.82 of 2 tests
- Images and chartsUnderstanding pictures, charts and video01Claude Opus 4.81 of 1 test
- Long documentsFinding answers in very long texts00Even0 each · 1 tie
Images and charts and long documents 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.
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
- Fixes real GitHub issues in many programming languagesSWE-bench Multilingual+77.4points ahead
- Extremely hard research-level math problemsFrontierMath Tier 4+51.2points ahead
- Finds hard-to-locate facts by browsing the webBrowseComp+47.3points ahead
Where Claude Opus 4.5 pulls ahead
No clear win on a test scored out of 100.
Every test, side by side
All 49 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingClaude Opus 4.8
- SWE-bench MultilingualClaude Opus 4.8 by 77.4784.4+77.4
- SWE-bench ProClaude Opus 4.8 by 17.25269.2+17.2
- Terminal-Bench HardClaude Opus 4.8 by 11.34758.3+11.3
- LiveBench · Agentic CodingClaude Opus 4.8 by 10.839.750.5+10.8
- LMArena · WebDevClaude Opus 4.8 by 87 rating points14691556+87 rating
- SWE-bench VerifiedClaude Opus 4.8 by 7.780.988.6+7.7
- SciCodeClaude Opus 4.8 by 4.949.554.4+4.9
- LiveBench · CodingClaude Opus 4.8 by 2.179.781.8+2.1
AgentsClaude Opus 4.8
- BrowseCompClaude Opus 4.8 by 47.33784.3+47.3
- MCP AtlasClaude Opus 4.8 by 19.962.382.2+19.9
- OSWorld-VerifiedClaude Opus 4.8 by 17.166.383.4+17.1
- GDPValtie47.347.8tie
ReasoningClaude Opus 4.8
- ARC-AGI-2Claude Opus 4.8 by 34.537.672.1+34.5
- Humanity's Last ExamClaude Opus 4.8 by 18.630.148.7+18.6
- CritPtClaude Opus 4.8 by 16.34.620.9+16.3
- LiveBench · ReasoningClaude Opus 4.8 by 9.180.189.2+9.1
- GPQA DiamondClaude Opus 4.8 by 5.486.692+5.4
FactsClaude Opus 4.8
- AA-Omniscience · Non-hallucinationClaude Opus 4.8 by 21.73960.7+21.7
- SimpleQA VerifiedClaude Opus 4.8 by 7.345.753+7.3
- AA-Omniscience · AccuracyClaude Opus 4.8 by 2.246.648.8+2.2
Images and chartsClaude Opus 4.8
- CharXiv (RQ)Claude Opus 4.8 by 22.767.289.9+22.7
MathClaude Opus 4.8
- FrontierMath Tier 4Claude Opus 4.8 by 51.24.956.1+51.2
- FrontierMath Tiers 1-3 (v2)Claude Opus 4.8 by 45.634.480+45.6
- HMMT Feb. 2026Claude Opus 4.8 by 10.285.395.5+10.2
- AIME 2026Claude Opus 4.8 by 4.995.1100+4.9
- LiveBench · MathematicsClaude Opus 4.8 by 3.990.494.3+3.9
- IMOAnswerBenchtie8483.5tie
Following instructionsClaude Opus 4.8
- LiveBench · Instruction FollowingClaude Opus 4.8 by 9.462.572+9.4
- IFBenchClaude Opus 4.8 by 4.25862.2+4.2
Other results19 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.
- CyberGymClaude Opus 4.8 by 28.250.678.8+28.2
- frontiermath_tier_4_v1Claude Opus 4.8 by 27.14.231.3+27.1
- Artificial Analysis Coding IndexClaude Opus 4.8 by 26.547.874.3+26.5
- NL2RepoClaude Opus 4.8 by 26.543.269.7+26.5
- AA Agentic IndexClaude Opus 4.5 by 1759.642.6+17
- DeepSearchQA (F1)Claude Opus 4.8 by 1776.193.1+17
- ToolathlonClaude Opus 4.8 by 16.443.559.9+16.4
- Terminal-Bench 2.0Claude Opus 4.8 by 15.359.374.6+15.3
- AA-OmniscienceClaude Opus 4.8 by 14.81428.8+14.8
- HLE (with tools)Claude Opus 4.8 by 14.743.257.9+14.7
- AA IntelligenceClaude Opus 4.8 by 12.729.141.8+12.7
- ARC-AGI-1Claude Opus 4.8 by 10.58292.5+10.5
- livebench_data_analysisClaude Opus 4.5 by 8.474.466+8.4
- PaperBenchClaude Opus 4.8 by 7.472.980.3+7.4
- τ²-Bench Telecom (AA run)Claude Opus 4.8 by 4.989.594.4+4.9
- HMMT Nov. 2025Claude Opus 4.8 by 3.293.396.5+3.2
- livebench_languageClaude Opus 4.5 by 1.681.379.7+1.6
- Finance AgentClaude Opus 4.5 by 1.355.253.9+1.3
- LiveBenchClaude Opus 4.8 by 1.27677.2+1.2
Questions people ask
Which is better, Claude Opus 4.5 or Claude Opus 4.8?
Claude Opus 4.8 wins seven of the eight areas we test: coding, agents, reasoning, facts, images and charts, math and following instructions. Claude Opus 4.5 wins none. They are level on long documents.
Which is better for coding?
Claude Opus 4.8. It wins 8 of the 8 coding tests both models report; Claude Opus 4.5 wins none.
Which is cheaper?
Claude Opus 4.5 costs $5.00 per million input tokens and $25.00 per million output tokens; Claude Opus 4.8 costs $5.00 and $25.00. For a million tokens read plus a million written, they cost about the same.
How do you compare the two?
We use the 49 benchmark tests both models have published scores on. The verdict counts the 30 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 19 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.