Top Free Reasoning Tool-Calling AI Models
The best free reasoning tool-calling AI models right now, ranked and compared on price, context window and features. 10 models match. These are models you can use at no cost, either through a free tier or because they are priced at zero, and models that think step by step before answering, and models that can call tools and functions, which agents depend on.
- Nemotron 3.5 Super VL
NVIDIA · 1.05M context · Free · ZDR · Images · Reasoning · Tools
$0.150 in
$0.500 out - Inkling Small
Thinkingmachines · 524K context · Free · ZDR · Images · Reasoning · Tools
$0.450 in
$1.20 out - Inkling
Thinkingmachines · 524K context · Free · ZDR · Images · Reasoning · Tools
$1.00 in
$4.05 out - Nemotron 3 Ultra
NVIDIA · 262K context · Free · ZDR · Reasoning · Tools
$0.600 in
$2.40 out - Gemma 4 26B A4B
Google · 262K context · Free · ZDR · Images · Reasoning · Tools
$0.076 in
$0.255 out - Gemma 4 31B
Google · 262K context · Free · ZDR · Images · Reasoning · Tools
$0.200 in
$0.400 out - Nemotron 3.5 Lightning
NVIDIA · 262K context · Free · ZDR · Reasoning · Tools
$0.070 in
$0.200 out - LFM2.5-2.6B
Liquid · 128K context · Free · Reasoning · Tools
$0.350 in
$0.500 out - Laguna S 2.1
Poolside · 1.05M context · Free · Reasoning · Tools
$0.090 in
$0.180 out - Laguna XS 2.1
Poolside · 262K context · Free · Reasoning · Tools
$0.060 in
$0.120 out
Prices are per 1M tokens. Ranked by intelligence score where available, then newest.