Claude Opus 4.8 vs Muse Glimmer
Wins 6 of 8 areas
Coding · Agents · Reasoning · Facts · Images and charts · Math
Wins 2 of 8 areas
Long documents · Following instructions
Claude Opus 4.8 is the stronger all-rounder.Muse Glimmer is cheaper and better at long documents.
Scores updated · 25 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 software50Claude Opus 4.85 of 5 tests
- AgentsCarrying out multi-step tasks on its own50Claude Opus 4.85 of 5 tests
- ReasoningHard problems that need careful thinking30Claude Opus 4.83 of 3 tests
- FactsGetting facts right instead of making them up20Claude Opus 4.82 of 2 tests
- Images and chartsUnderstanding pictures, charts and video10Claude Opus 4.81 of 1 test
- MathCompetition and research-level math10Claude Opus 4.81 of 1 test
- Long documentsFinding answers in very long texts01Muse Glimmer1 of 1 test
- Following instructionsDoing exactly what it is asked01Muse Glimmer1 of 1 test
Images and charts, 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.
Muse Glimmer costs 94% 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
- Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+42.6points ahead
- Real work tasks from 44 professionsGDPVal+33.3points ahead
- Command-line tasks in a real terminalTerminal-Bench 2.1+32.9points ahead
Every test, side by side
All 25 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingClaude Opus 4.8
- Terminal-Bench 2.1Claude Opus 4.8 by 32.984.651.7+32.9
- LMArena · WebDevClaude Opus 4.8 by 196 rating points15561360+196 rating
- SWE-bench ProClaude Opus 4.8 by 1869.251.2+18
- SWE-bench VerifiedClaude Opus 4.8 by 12.688.676+12.6
- SciCodeClaude Opus 4.8 by 9.554.444.9+9.5
AgentsClaude Opus 4.8
- GDPValClaude Opus 4.8 by 33.347.814.5+33.3
- Terminal-Bench 4.0Claude Opus 4.8 by 21.221.70.5+21.2
- OSWorld-VerifiedClaude Opus 4.8 by 17.583.465.9+17.5
- τ-Bench V3 · BankingClaude Opus 4.8 by 10.734.223.5+10.7
- MCP AtlasClaude Opus 4.8 by 6.782.275.5+6.7
ReasoningClaude Opus 4.8
- Humanity's Last ExamClaude Opus 4.8 by 26.748.722+26.7
- CritPtClaude Opus 4.8 by 18.320.92.6+18.3
- GPQA DiamondClaude Opus 4.8 by 8.59283.5+8.5
FactsClaude Opus 4.8
- AA-Omniscience · Non-hallucinationClaude Opus 4.8 by 42.660.718.1+42.6
- AA-Omniscience · AccuracyClaude Opus 4.8 by 21.848.827+21.8
Images and chartsClaude Opus 4.8
- CharXiv (RQ)Claude Opus 4.8 by 11.189.978.8+11.1
Following instructionsMuse Glimmer
- IFBenchMuse Glimmer by 14.862.277+14.8
Other results6 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.
- AA-OmniscienceClaude Opus 4.8 by 61.628.8-32.9+61.6
- AA Agentic IndexClaude Opus 4.8 by 32.142.610.5+32.1
- Artificial Analysis Coding IndexClaude Opus 4.8 by 25.374.349+25.3
- AA IntelligenceClaude Opus 4.8 by 24.341.817.5+24.3
- DeepSearchQA (F1)Claude Opus 4.8 by 18.593.174.6+18.5
- ScreenSpot-Pro (No tools)Claude Opus 4.8 by 12.587.975.4+12.5
Questions people ask
Which is better, Claude Opus 4.8 or Muse Glimmer?
Claude Opus 4.8 wins six of the eight areas we test: coding, agents, reasoning, facts, images and charts and math. Muse Glimmer wins long documents and following instructions, and costs 94% less.
Which is better for coding?
Claude Opus 4.8. It wins 5 of the 5 coding tests both models report; Muse Glimmer wins none.
Which is cheaper?
Claude Opus 4.8 costs $5.00 per million input tokens and $25.00 per million output tokens; Muse Glimmer costs $0.33 and $1.35. That makes Muse Glimmer about 94% cheaper for the same work.
How do you compare the two?
We use the 25 benchmark tests both models have published scores on. The verdict counts the 19 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 6 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.