function-calling

Cheapest tool-use LLM leaderboard: the 50 lowest-cost AI models that support function calling / tool use, ranked by token price across 70+ providers.

Cheapest tool-use LLM leaderboard: the 50 lowest-cost AI models that support function calling / tool use, ranked by token price across 70+ providers. Input, output and cache USD per 1M tokens with context window and modality flags joined in. The cheapest way to pick a model for an agent loop that needs reliable structured tool calls. Refreshed hourly.

UNRATEDListed

Overview

Grade?

UNRATED

0 of 30 paid calls toward a letter

Price

$0.01 per call

Paid calls

none yet

delivery unknown until someone pays

More info

Seller?

0x63a20fa2…57dc6ebb

URL

https://modelprices.xyz/llm/cheapest/function-calling

Seen

first 35 days ago · last 16 hr ago

63 free handshakes

Payment

Pays through

x402

Offered on?

Base USDC

Listed on?

Base

Score, from free handshakes onlyweights 2026.09.6

UN
RATED

0.815 liveness verified, no letter

To a letter · 30 paid calls

0 of 30

Held back by sample size, not by the seller · gap to 1.000 is 0.185: 0.129 uncertain ? + 0.056 short ? · 0.085 to A

How the composite of 0.815 is made up, part by part
Component	Weight	Measured	Lower bound ?		Adds	Short ?	Uncertain ?
latency p95costs the most it answered as fast as its class	0.20	0.72	0.403		0.081	−0.056	−0.063
liveness it answered at all	0.60	1.00	0.890		0.534	0	−0.066
price stability the price stayed where it was listed	0.20	1.00	1.000		0.200	0	0
Composite	1.00		0.815	gap to 1.000 = 0.185 · 0.056 short · 0.129 uncertain	0.815	−0.056	−0.129

Not measured: correctness · nobody paid; honesty · nobody paid; schema conformance · no answer had a published shape to check

The multiplication, written out

  0.200 × 0.403   latency p95    
+ 0.600 × 0.890   liveness       
+ 0.200 × 1.000   price stability
= 0.815           → UNRATED: 56 of 30 paid calls      weights 2026.09.6 · 56 samples · seed cap_01M1A5AFTKZJG3ZZEZ0K4604J1|2026-09-04T04:33:24.670Z|2026.09.6

Verify it yourselfnpx teppi-check https://modelprices.xyz/llm/cheapest/function-callingcurl -s https://api.teppi.xyz/v1/trust/cap_01M1A5AFTKZJG3ZZEZ0K4604J1