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Claude Opus 5.5 vs Muse Glimmer 30B

Claude Opus 5.5 grades higher overall (99.5 against 59.5). Muse Glimmer 30B costs 93% less for the same work.

Claude Opus 5.5

by Anthropic · #1 of 67 overall

Coming soon · price at launch
Context
1M
Input / 1M
$4.00
Output / 1M
$20.00

Muse Glimmer 30B

by Meta · #39 of 67 overall

Coming soon · price at launch
Context
128K
Input / 1M
$0.30
Output / 1M
$1.20

Better overall

Claude Opus 5.5

Grade 99.5 vs 59.5

Cheaper

Muse Glimmer 30B

93% less, $0.53 vs $8.00 blended

Larger context

Claude Opus 5.5

1M vs 128K tokens

SWE-Bench Pro

Claude Opus 5.5

89.9% vs 51.2%

Head to head

Public benchmarks. Longer is better; each value links to its source.

LMArena TextElo-style rating · LMArena (CC BY 4.0) · Oct 15, 2026
Claude Opus 5.5Claude Opus 5.5: 1,508
Muse Glimmer 30BMuse Glimmer 30B: 1,425
LMArena WebDevElo-style rating · LMArena (CC BY 4.0) · Oct 13, 2026
Claude Opus 5.5Claude Opus 5.5: 1,811
Muse Glimmer 30BMuse Glimmer 30B: 1,355
LMArena CodingElo-style rating · LMArena (CC BY 4.0) · Oct 15, 2026
Claude Opus 5.5Claude Opus 5.5: 1,545
Muse Glimmer 30BMuse Glimmer 30B: 1,479
SWE-bench Verified% of issues resolved · SWE-bench · reference
Claude Opus 5.5Claude Opus 5.5: —
Muse Glimmer 30BMuse Glimmer 30B: 76%v
SWE-Bench Pro% of tasks resolved · Scale AI SWE-Bench Pro · Sep 22, 2026 · reference
Terminal-Bench 4.0% of tasks passed · Terminal-Bench · Sep 22, 2026 · reference
Muse Glimmer 30BMuse Glimmer 30B: —
Terminal-Bench 2.1% of tasks passed · Terminal-Bench · reference
Claude Opus 5.5Claude Opus 5.5: —
Muse Glimmer 30BMuse Glimmer 30B: 51.7%v

Claude Opus 5.5Muse Glimmer 30Bv = reported by the model’s maker. — = no public score yet. Arena bars span the range across every model we grade.

What it costs you

Drag to match your monthly usage.

Claude Opus 5.5$1,600 /month
Muse Glimmer 30B$108 /month

Muse Glimmer 30B saves you $1,492 a month at this usage, $17,904 a year.

At a glance

AttributeClaude Opus 5.5Muse Glimmer 30B
Made byAnthropicMeta
AvailabilityComing soonComing soon
Overall gradeExcellent · 99.5Strong · 59.5
Overall rank#1 of 67#39 of 67
Input price$4.00 per 1M$0.30 per 1M
Output price$20.00 per 1M$1.20 per 1M
Context window1,000,000 tokens131,072 tokens
Reasoning levelsYesNo
Reads imagesYesYes
Model IDclaude-opus-5-5muse-glimmer-30b

Try both with one key

Same endpoint, same key, both hosted in the USA. Change one word to switch models, in Claude Code, Cursor, Cline or your own code.

Get your API key
# Ask either model the same thing
curl https://fullsendai.com/v1/chat/completions \
  -H "Authorization: Bearer $FULLSEND_API_KEY" \
  -d '{"model": "claude-opus-5-5", "messages": [...]}'

# …then swap one word
  -d '{"model": "muse-glimmer-30b", "messages": [...]}'

Questions

Is Claude Opus 5.5 or Muse Glimmer 30B better?

Claude Opus 5.5 grades 99.5 against 59.5 for Muse Glimmer 30B, from public benchmarks.

Which is cheaper, Claude Opus 5.5 or Muse Glimmer 30B?

Muse Glimmer 30B: $0.30 in and $1.20 out per million tokens, against $4.00 and $20.00 through FullsendAI.

Which has the larger context window?

Claude Opus 5.5, with 1,000,000 tokens.

Can I use both with one API key?

Yes, once they launch: both are coming soon, at the prices shown, and both will use the same FullsendAI key.

Model rankingsAll benchmarksCompare other models

Scores: LMArena (CC BY 4.0), SWE-bench, Scale AI SWE-Bench Pro, Terminal-Bench, and model makers’ published results where marked v. Prices are FullsendAI’s, per million tokens. Data as of Oct 28, 2026.