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Claude Opus 5.5 vs NVIDIA Nemotron 3.5 Lightning

Claude Opus 5.5 grades higher overall (99.5 against 50.7). NVIDIA Nemotron 3.5 Lightning 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

NVIDIA Nemotron 3.5 Lightning

by NVIDIA · #47 of 67 overall

Coming soon · price at launch
Context
256K
Input / 1M
$0.060
Output / 1M
$0.16

Better overall

Claude Opus 5.5

Grade 99.5 vs 50.7

Cheaper

NVIDIA Nemotron 3.5 Lightning

99% less, $0.085 vs $8.00 blended

Larger context

Claude Opus 5.5

1M vs 256K 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
NVIDIA Nemotron 3.5 LightningNVIDIA Nemotron 3.5 Lightning: 1,351
LMArena WebDevElo-style rating · LMArena (CC BY 4.0) · Oct 13, 2026
Claude Opus 5.5Claude Opus 5.5: 1,811
NVIDIA Nemotron 3.5 LightningNVIDIA Nemotron 3.5 Lightning: —
LMArena CodingElo-style rating · LMArena (CC BY 4.0) · Oct 15, 2026
Claude Opus 5.5Claude Opus 5.5: 1,545
NVIDIA Nemotron 3.5 LightningNVIDIA Nemotron 3.5 Lightning: 1,425
SWE-bench Verified% of issues resolved · SWE-bench · Aug 11, 2026 · reference
Claude Opus 5.5Claude Opus 5.5: —
NVIDIA Nemotron 3.5 LightningNVIDIA Nemotron 3.5 Lightning: 51.6%v
SWE-Bench Pro% of tasks resolved · Scale AI SWE-Bench Pro · Sep 22, 2026 · reference
Claude Opus 5.5Claude Opus 5.5: 89.9%v
NVIDIA Nemotron 3.5 LightningNVIDIA Nemotron 3.5 Lightning: —
Terminal-Bench 4.0% of tasks passed · Terminal-Bench · Sep 22, 2026 · reference
Claude Opus 5.5Claude Opus 5.5: 66.4%v
NVIDIA Nemotron 3.5 LightningNVIDIA Nemotron 3.5 Lightning: —
Terminal-Bench 2.1% of tasks passed · Terminal-Bench · Aug 11, 2026 · reference
Claude Opus 5.5Claude Opus 5.5: —
NVIDIA Nemotron 3.5 LightningNVIDIA Nemotron 3.5 Lightning: 24.6%v

Claude Opus 5.5NVIDIA Nemotron 3.5 Lightningv = 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
NVIDIA Nemotron 3.5 Lightning$18.40 /month

NVIDIA Nemotron 3.5 Lightning saves you $1,582 a month at this usage, $18,979 a year.

At a glance

AttributeClaude Opus 5.5NVIDIA Nemotron 3.5 Lightning
Made byAnthropicNVIDIA
AvailabilityComing soonComing soon
Overall gradeExcellent · 99.5Good · 50.7
Overall rank#1 of 67#47 of 67
Input price$4.00 per 1M$0.060 per 1M
Output price$20.00 per 1M$0.16 per 1M
Context window1,000,000 tokens262,144 tokens
Reasoning levelsYesNo
Reads imagesYesNo
Model IDclaude-opus-5-5nvidia-nemotron-3.5-lightning

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": "nvidia-nemotron-3.5-lightning", "messages": [...]}'

Questions

Is Claude Opus 5.5 or NVIDIA Nemotron 3.5 Lightning better?

Claude Opus 5.5 grades 99.5 against 50.7 for NVIDIA Nemotron 3.5 Lightning, from public benchmarks.

Which is cheaper, Claude Opus 5.5 or NVIDIA Nemotron 3.5 Lightning?

NVIDIA Nemotron 3.5 Lightning: $0.060 in and $0.16 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.

Compare with others

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.