Claude Opus 5.5NVIDIA Nemotron 3 Ultra 550B A55Bv = 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 Ultra 550B A55B$188 /month
NVIDIA Nemotron 3 Ultra 550B A55B saves you $1,412 a month at this usage, $16,944 a year.
At a glance
Attribute
Claude Opus 5.5
NVIDIA Nemotron 3 Ultra 550B A55B
Made by
Anthropic
NVIDIA
Availability
Coming soon
Coming soon
Overall grade
Excellent · 99.5
Excellent · 72.8
Overall rank
#1 of 67
#26 of 67
Input price
$4.00 per 1M
$0.50 per 1M
Output price
$20.00 per 1M
$2.20 per 1M
Context window
1,000,000 tokens
262,144 tokens
Reasoning levels
Yes
No
Reads images
Yes
No
Model ID
claude-opus-5-5
nvidia-nemotron-3-ultra-550b-a55b
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.
# Ask either model the same thingcurlhttps://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-ultra-550b-a55b", "messages": [...]}'
Questions
Is Claude Opus 5.5 or NVIDIA Nemotron 3 Ultra 550B A55B better?
Claude Opus 5.5 grades 99.5 against 72.8 for NVIDIA Nemotron 3 Ultra 550B A55B, from public benchmarks.
Which is cheaper, Claude Opus 5.5 or NVIDIA Nemotron 3 Ultra 550B A55B?
NVIDIA Nemotron 3 Ultra 550B A55B: $0.50 in and $2.20 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.
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.
