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Nemotron 3 Ultra (free)

nvidia·nvidia/nemotron-3-ultra-550b-a55b-free·GA·Open weights·nemotron series
Largest Nemotron 3 model for maximum open-weight reasoning and agent accuracy

Specs & pricing

Input / output per 1M tokens
Reference price·Bothub
$0 / $0
Blended $0 · Cache read —
Lowest paid
No paid channels
4 more $0 channels
Context
1,000,000
Output limit
128,000
Knowledge cutoff
2026-02
Released / updated
2026-06-04 / 2026-06-04
Capabilities
✓ Reasoning✓ Tool useStructured output✓ TemperatureAttachments
Modalities
Text

Available at 4 providers0 with public prices · 4 free

ProviderTierInputOutputCache readCache writeContextOutput limitStatus
Bothub
nemotron-3-ultra-550b-a55b:free
GatewayFree——1,000,000128,000
OpenRouter
nvidia/nemotron-3-ultra-550b-a55b:free
GatewayFree——1,000,00065,536
OpenCode Zen
nemotron-3-ultra-free
GatewayFree$0—1,000,000128,000
Kilo Gateway
nvidia/nemotron-3-ultra-550b-a55b:free
GatewayFree——1,000,00065,536

Sorted by blended price (input×0.75 + output×0.25) asc. The official channel always shows regardless of rank. Whether a gateway's low price is actually usable can't be verified.

Reasoning control

effort = noneeffort = mediumeffort = highToggle (on / off)budget_tokens

Interleaved thinking (reasoning between tool calls) is declared by 2 of 4 providers.

1 / 4 providers expose no reasoning control (reasoning_options: []).

Your usage cost

This model is $0 across all listed channels (Bothub, OpenRouter, OpenCode Zen, Kilo Gateway).

Price historyone sample accumulated per data sync

Input listOutput listMin blended
$0.0001$02026-08-052026-08-132026-08-05 · Input list $02026-08-06 · Input list $02026-08-07 · Input list $02026-08-08 · Input list $02026-08-09 · Input list $02026-08-10 · Input list $02026-08-11 · Input list $02026-08-12 · Input list $02026-08-13 · Input list $02026-08-05 · Output list $02026-08-06 · Output list $02026-08-07 · Output list $02026-08-08 · Output list $02026-08-09 · Output list $02026-08-10 · Output list $02026-08-11 · Output list $02026-08-12 · Output list $02026-08-13 · Output list $0

Related models

Nemotron 3.5 Lightning 30B A3Bsame series$0 / $0Nemotron 3.5 Lightning (free)same series$0 / $0Nemotron 3.5 Lightningsame series$0.07 / $0.20
Data partly from models.dev (MIT) · Bothub official docs ↗