Error: No tokenizer found for model with Ollama

[luochen1990]

Describe the bug

Trying to use ollama but failed with Error: No tokenizer found for model, tried to change the model but still same error.

To Reproduce

[openai]
api_base = "http://127.0.0.1:11434/v1"
api_key = ""
model = "llama3.1:latest"
retries = 2
proxy = ""

1. Run ollama server locally
2. Exec ollama run llama3.1:latest
3. Try some talk to Confirm that ollama is running without issue
4. Edit ~/.config/gptcommit/config.toml and add above config
5. git add something and Execute git commit
6. See error

Expected behavior

Works correctly and without error

Screenshots
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System Info (please complete the following information):

• OS: linux (NixOS unstable)
• Version: gptcommit v0.5.16

[assafmo]

Happens to me to with groq:

[openai]
api_base = "https://api.groq.com/openai/v1"
api_key = "XXX"
model = "llama-3.2-90b-text-preview"
retries = 2
proxy = ""

[scylamb]

Happens to me to with gpt-4o-mini

STDERR: Error: No tokenizer found for model gpt-4o-mini

[rmnilin]

This error occurs here

gptcommit/src/llms/openai.rs

Line 101 in 94eeb2f

let prompt_token_limit = get_completion_max_tokens(&self.model, prompt)?;

because this library relies on https://github.com/zurawiki/tiktoken-rs to count and limit prompt tokens. Both libraries are intended to be used exclusively with OpenAI models:

• Add Bedrock, Ollama, Claude2, Cohere, Replicate [100+ LLMs] - using LiteLLM #246
• https://github.com/zurawiki/tiktoken-rs/blob/088ff6d51629acea1624298151df148f328d6d0c/tiktoken-rs/src/tokenizer.rs#L33.

For ollama users, there's a workaround that involves creating an alias for a target model. Here's how you can do it:

$ ollama cp qwen2.5-coder:7b gpt-4--gptcommit-workaround-alias--qwen2.5-coder:7b

# gptcommit/config.toml
[openai]
api_base = "http://localhost:11434/v1"
api_key = ""
model = "gpt-4--gptcommit-workaround-alias--qwen2.5-coder:7b"
retries = 2
proxy = ""

To remove the alias when you no longer need it, use the following command:

$ ollama rm gpt-4--gptcommit-workaround-alias--qwen2.5-coder:7b

Only alias will be removed, not the original model.

Also note that you can use any name or prefix from the zurawiki/tiktoken-rs enums linked above, but there are different logic depending on the model prefix, see

gptcommit/src/llms/openai.rs

Line 95 in 94eeb2f

pub(crate) fn should_use_chat_completion(model: &str) -> bool {