Arcee AI: AFM 4.5B

Text input Text output Unavailable
Author's Description

AFM-4.5B is a 4.5 billion parameter instruction-tuned language model developed by Arcee AI. The model was pretrained on approximately 8 trillion tokens, including 6.5 trillion tokens of general data and 1.5 trillion tokens with an emphasis on mathematical reasoning and code generation.

Key Specifications
Cost
$$$
Context
65K
Parameters
5B
Released
Sep 16, 2025
Speed
Ability
Reliability
Supported Parameters

This model supports the following parameters:

Temperature Stop Structured Outputs Max Tokens Presence Penalty Min P Response Format Frequency Penalty Logit Bias Top P
Features

This model supports the following features:

Response Format Structured Outputs
Performance Summary

Arcee AI's AFM-4.5B model demonstrates moderate speed performance, ranking in the 38th percentile across benchmarks. It offers cost-effective solutions, typically falling within the 68th percentile for price. Notably, the model exhibits exceptional reliability with a 99% success rate, indicating consistent and usable responses. In terms of performance across categories, AFM-4.5B shows a solid ability to acknowledge uncertainty, achieving 92.0% accuracy in hallucination detection. Its general knowledge is also strong at 95.0% accuracy. However, the model struggles significantly in more complex cognitive tasks. It shows weaknesses in Ethics (91.0% accuracy, 25th percentile), Mathematics (51.0% accuracy, 24th percentile), Instruction Following (22.7% accuracy, 26th percentile), and particularly in Reasoning (25.5% accuracy, 17th percentile). While its Coding performance is moderate at 66.3% accuracy, its Email Classification accuracy is low at 88.0% (12th percentile). Key strengths include its high reliability, cost-effectiveness, and proficiency in general knowledge and identifying fictional concepts. Its notable weaknesses lie in advanced reasoning, mathematical problem-solving, and precise instruction following, suggesting areas for further development.

Model Pricing

Current Pricing

Feature Price (per 1M tokens)
Prompt $0.048
Completion $0.15

Price History

Available Endpoints
Provider Endpoint Name Context Length Pricing (Input) Pricing (Output)
Together
Together | arcee-ai/afm-4.5b 65K $0.048 / 1M tokens $0.15 / 1M tokens
Benchmark Results
Benchmark Category Reasoning Strategy Free Executions Accuracy Cost Duration
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