Claude Fable 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 Fable 5$4,000 /month
NVIDIA Nemotron 3.5 Lightning$18.40 /month
NVIDIA Nemotron 3.5 Lightning saves you $3,982 a month at this usage, $47,779 a year.
At a glance
Attribute
Claude Fable 5
NVIDIA Nemotron 3.5 Lightning
Made by
Anthropic
NVIDIA
Availability
Coming soon
Coming soon
Overall grade
Excellent · 90.7
Good · 50.7
Overall rank
#3 of 67
#47 of 67
Input price
$10.00 per 1M
$0.060 per 1M
Output price
$50.00 per 1M
$0.16 per 1M
Context window
1,000,000 tokens
262,144 tokens
Reasoning levels
Yes
No
Reads images
Yes
No
Model ID
claude-fable-5
nvidia-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.
# Ask either model the same thingcurlhttps://fullsendai.com/v1/chat/completions \-H"Authorization: Bearer $FULLSEND_API_KEY" \-d'{"model": "claude-fable-5", "messages": [...]}'# …then swap one word-d'{"model": "nvidia-nemotron-3.5-lightning", "messages": [...]}'
Questions
Is Claude Fable 5 or NVIDIA Nemotron 3.5 Lightning better?
Claude Fable 5 grades 90.7 against 50.7 for NVIDIA Nemotron 3.5 Lightning, from public benchmarks.
Which is cheaper, Claude Fable 5 or NVIDIA Nemotron 3.5 Lightning?
NVIDIA Nemotron 3.5 Lightning: $0.060 in and $0.16 out per million tokens, against $10.00 and $50.00 through FullsendAI.
Which has the larger context window?
Claude Fable 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.
