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Claude Opus 5.5 vs Gemma 3 12B IT

Claude Opus 5.5 grades higher overall (99.5 against 35.0). Gemma 3 12B IT costs 99% 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

Gemma 3 12B IT

by Google · #59 of 67 overall

Coming soon · price at launch
Context
128K
Input / 1M
$0.050
Output / 1M
$0.15

Better overall

Claude Opus 5.5

Grade 99.5 vs 35.0

Cheaper

Gemma 3 12B IT

99% less, $0.075 vs $8.00 blended

Larger context

Claude Opus 5.5

1M vs 128K tokens

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
Gemma 3 12B ITGemma 3 12B IT: 1,342
LMArena WebDevElo-style rating · LMArena (CC BY 4.0) · Oct 13, 2026
Claude Opus 5.5Claude Opus 5.5: 1,811
Gemma 3 12B ITGemma 3 12B IT: —
LMArena CodingElo-style rating · LMArena (CC BY 4.0) · Oct 15, 2026
Claude Opus 5.5Claude Opus 5.5: 1,545
Gemma 3 12B ITGemma 3 12B IT: 1,316
SWE-Bench Pro% of tasks resolved · Scale AI SWE-Bench Pro · Sep 22, 2026 · reference
Gemma 3 12B ITGemma 3 12B IT: —
Terminal-Bench 4.0% of tasks passed · Terminal-Bench · Sep 22, 2026 · reference
Gemma 3 12B ITGemma 3 12B IT: —

Claude Opus 5.5Gemma 3 12B ITv = 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
Gemma 3 12B IT$16.00 /month

Gemma 3 12B IT saves you $1,584 a month at this usage, $19,008 a year.

At a glance

AttributeClaude Opus 5.5Gemma 3 12B IT
Made byAnthropicGoogle
AvailabilityComing soonComing soon
Overall gradeExcellent · 99.5Good · 35.0
Overall rank#1 of 67#59 of 67
Input price$4.00 per 1M$0.050 per 1M
Output price$20.00 per 1M$0.15 per 1M
Context window1,000,000 tokens131,072 tokens
Reasoning levelsYesNo
Reads imagesYesYes
Model IDclaude-opus-5-5gemma-3-12b-it

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": "gemma-3-12b-it", "messages": [...]}'

Questions

Is Claude Opus 5.5 or Gemma 3 12B IT better?

Claude Opus 5.5 grades 99.5 against 35.0 for Gemma 3 12B IT, from public benchmarks.

Which is cheaper, Claude Opus 5.5 or Gemma 3 12B IT?

Gemma 3 12B IT: $0.050 in and $0.15 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), 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.