Models that natively support function or tool calling — foundational for building agents, RAG with structured retrieval, or any LLM workflow that needs to invoke external systems. Ranked by input price ascending.
Methodology
How this ranking is built
Active models with verified function-calling support and a published input price. Ranked from cheapest input cost upward.
#
Model
Provider
Input price
Lifecycle
Verified
1
gpt-oss-20b
OpenAI · Active
OPOpenAI
$0.03/M input
Active
· 45m ago
2
Amazon Nova Micro
AWS Bedrock · Active
ABAWS Bedrock
$0.04/M input
Active
· 1h ago
3
gpt-oss-120b
OpenAI · Active
OPOpenAI
$0.04/M input
Active
· 46m ago
4
GPT-5 Nano
OpenAI · Active
OPOpenAI
$0.05/M input
Active
· 47m ago
5
o3
OpenAI · Active
OPOpenAI
$0.06/M input
Active
· 45m ago
6
Amazon Nova Lite
AWS Bedrock · Active
ABAWS Bedrock
$0.06/M input
Active
· 1h ago
7
GPT-4.1 Nano
OpenAI · Active
OPOpenAI
$0.1/M input
Active
· 48m ago
8
Gemini 2.0 Flash
Google Gemini · Active
GGGoogle Gemini
$0.1/M input
Active
· 57m ago
9
Gemini 2.5 Flash-Lite
Google Gemini · Active
GGGoogle Gemini
$0.1/M input
Active
· 56m ago
10
Llama 3.3 70B
Meta · Active
MEMeta
$0.1/M input
Active
—
11
GPT-4o Mini
OpenAI · Active
OPOpenAI
$0.15/M input
Active
· 48m ago
12
Llama 4 Maverick
Meta · Active
MEMeta
$0.15/M input
Active
—
13
GPT-5.4 Nano
OpenAI · Active
OPOpenAI
$0.2/M input
Active
· 46m ago
14
GPT-5 Mini
OpenAI · Active
OPOpenAI
$0.25/M input
Active
· 48m ago
15
Gemini 3.1 Flash-Lite
Google Gemini · Active
GGGoogle Gemini
$0.25/M input
Active
· 55m ago
16
Gemini 2.5 Flash
Google Gemini · Active
GGGoogle Gemini
$0.3/M input
Active
· 56m ago
17
GPT-4.1 Mini
OpenAI · Active
OPOpenAI
$0.4/M input
Active
· 48m ago
18
GPT-5.4 Mini
OpenAI · Active
OPOpenAI
$0.75/M input
Active
· 46m ago
19
Claude Haiku 3.5
Anthropic · Active
ANAnthropic
$0.8/M input
Active
· 1h ago
20
Amazon Nova Pro
AWS Bedrock · Active
ABAWS Bedrock
$0.8/M input
Active
· 1h ago
21
Claude Haiku 4.5
Anthropic · Active
ANAnthropic
$1/M input
Active
· 1h ago
22
Grok Build 0.1
xAI · Active
XAxAI
$1/M input
Active
· 43m ago
23
o4-mini
OpenAI · Active
OPOpenAI
$1.1/M input
Active
· 44m ago
24
GPT-5
OpenAI · Active
OPOpenAI
$1.25/M input
Active
· 48m ago
25
GPT-5.1
OpenAI · Active
OPOpenAI
$1.25/M input
Active
· 47m ago
Showing top 25 of 49 matches. Refreshed as we re-verify each model against its provider's official docs. Every value links to the page it came from.
Last updated Jun 15, 2026 17:57 UTC.
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