Instructions to use EricSpencer00/chattla-20b with libraries, inference providers, notebooks, and local apps. Follow these links to get started.

Libraries

How to use EricSpencer00/chattla-20b with Transformers:

# Use a pipeline as a high-level helper
from transformers import pipeline

pipe = pipeline("text-generation", model="EricSpencer00/chattla-20b")
messages = [
    {"role": "user", "content": "Who are you?"},
]
pipe(messages)

# Load model directly
from transformers import AutoTokenizer, AutoModelForCausalLM

tokenizer = AutoTokenizer.from_pretrained("EricSpencer00/chattla-20b")
model = AutoModelForCausalLM.from_pretrained("EricSpencer00/chattla-20b")
messages = [
    {"role": "user", "content": "Who are you?"},
]
inputs = tokenizer.apply_chat_template(
	messages,
	add_generation_prompt=True,
	tokenize=True,
	return_dict=True,
	return_tensors="pt",
).to(model.device)

outputs = model.generate(**inputs, max_new_tokens=40)
print(tokenizer.decode(outputs[0][inputs["input_ids"].shape[-1]:]))

llama-cpp-python

How to use EricSpencer00/chattla-20b with llama-cpp-python:

# !pip install llama-cpp-python

from llama_cpp import Llama

llm = Llama.from_pretrained(
	repo_id="EricSpencer00/chattla-20b",
	filename="gguf/chattla-20b-v10-Q8_0.gguf",
)

llm.create_chat_completion(
	messages = [
		{
			"role": "user",
			"content": "What is the capital of France?"
		}
	]
)

Notebooks
Google Colab
Kaggle
Local Apps

llama.cpp

How to use EricSpencer00/chattla-20b with llama.cpp:

Install from brew

brew install llama.cpp
# Start a local OpenAI-compatible server with a web UI:
llama-server -hf EricSpencer00/chattla-20b:Q8_0
# Run inference directly in the terminal:
llama-cli -hf EricSpencer00/chattla-20b:Q8_0

Install from WinGet (Windows)

winget install llama.cpp
# Start a local OpenAI-compatible server with a web UI:
llama-server -hf EricSpencer00/chattla-20b:Q8_0
# Run inference directly in the terminal:
llama-cli -hf EricSpencer00/chattla-20b:Q8_0

Use pre-built binary

# Download pre-built binary from:
# https://github.com/ggerganov/llama.cpp/releases
# Start a local OpenAI-compatible server with a web UI:
./llama-server -hf EricSpencer00/chattla-20b:Q8_0
# Run inference directly in the terminal:
./llama-cli -hf EricSpencer00/chattla-20b:Q8_0

Build from source code

git clone https://github.com/ggerganov/llama.cpp.git
cd llama.cpp
cmake -B build
cmake --build build -j --target llama-server llama-cli
# Start a local OpenAI-compatible server with a web UI:
./build/bin/llama-server -hf EricSpencer00/chattla-20b:Q8_0
# Run inference directly in the terminal:
./build/bin/llama-cli -hf EricSpencer00/chattla-20b:Q8_0

Use Docker

docker model run hf.co/EricSpencer00/chattla-20b:Q8_0

LM Studio
Jan

vLLM

How to use EricSpencer00/chattla-20b with vLLM:

Install from pip and serve model

# Install vLLM from pip:
pip install vllm
# Start the vLLM server:
vllm serve "EricSpencer00/chattla-20b"
# Call the server using curl (OpenAI-compatible API):
curl -X POST "http://localhost:8000/v1/chat/completions" \
	-H "Content-Type: application/json" \
	--data '{
		"model": "EricSpencer00/chattla-20b",
		"messages": [
			{
				"role": "user",
				"content": "What is the capital of France?"
			}
		]
	}'

Use Docker

docker model run hf.co/EricSpencer00/chattla-20b:Q8_0

SGLang

How to use EricSpencer00/chattla-20b with SGLang:

Install from pip and serve model

# Install SGLang from pip:
pip install sglang
# Start the SGLang server:
python3 -m sglang.launch_server \
    --model-path "EricSpencer00/chattla-20b" \
    --host 0.0.0.0 \
    --port 30000
# Call the server using curl (OpenAI-compatible API):
curl -X POST "http://localhost:30000/v1/chat/completions" \
	-H "Content-Type: application/json" \
	--data '{
		"model": "EricSpencer00/chattla-20b",
		"messages": [
			{
				"role": "user",
				"content": "What is the capital of France?"
			}
		]
	}'

Use Docker images

docker run --gpus all \
    --shm-size 32g \
    -p 30000:30000 \
    -v ~/.cache/huggingface:/root/.cache/huggingface \
    --env "HF_TOKEN=<secret>" \
    --ipc=host \
    lmsysorg/sglang:latest \
    python3 -m sglang.launch_server \
        --model-path "EricSpencer00/chattla-20b" \
        --host 0.0.0.0 \
        --port 30000
# Call the server using curl (OpenAI-compatible API):
curl -X POST "http://localhost:30000/v1/chat/completions" \
	-H "Content-Type: application/json" \
	--data '{
		"model": "EricSpencer00/chattla-20b",
		"messages": [
			{
				"role": "user",
				"content": "What is the capital of France?"
			}
		]
	}'

Ollama
How to use EricSpencer00/chattla-20b with Ollama:
```
ollama run hf.co/EricSpencer00/chattla-20b:Q8_0
```

Unsloth Studio new

How to use EricSpencer00/chattla-20b with Unsloth Studio:

Install Unsloth Studio (macOS, Linux, WSL)

curl -fsSL https://unsloth.ai/install.sh | sh
# Run unsloth studio
unsloth studio -H 0.0.0.0 -p 8888
# Then open http://localhost:8888 in your browser
# Search for EricSpencer00/chattla-20b to start chatting

Install Unsloth Studio (Windows)

irm https://unsloth.ai/install.ps1 | iex
# Run unsloth studio
unsloth studio -H 0.0.0.0 -p 8888
# Then open http://localhost:8888 in your browser
# Search for EricSpencer00/chattla-20b to start chatting

Using HuggingFace Spaces for Unsloth

# No setup required
# Open https://huggingface.co/spaces/unsloth/studio in your browser
# Search for EricSpencer00/chattla-20b to start chatting

Pi new

How to use EricSpencer00/chattla-20b with Pi:

Start the llama.cpp server

# Install llama.cpp:
brew install llama.cpp
# Start a local OpenAI-compatible server:
llama-server -hf EricSpencer00/chattla-20b:Q8_0

Configure the model in Pi

# Install Pi:
npm install -g @mariozechner/pi-coding-agent
# Add to ~/.pi/agent/models.json:
{
  "providers": {
    "llama-cpp": {
      "baseUrl": "http://localhost:8080/v1",
      "api": "openai-completions",
      "apiKey": "none",
      "models": [
        {
          "id": "EricSpencer00/chattla-20b:Q8_0"
        }
      ]
    }
  }
}

Run Pi

# Start Pi in your project directory:
pi

Hermes Agent new

How to use EricSpencer00/chattla-20b with Hermes Agent:

Start the llama.cpp server

# Install llama.cpp:
brew install llama.cpp
# Start a local OpenAI-compatible server:
llama-server -hf EricSpencer00/chattla-20b:Q8_0

Configure Hermes

# Install Hermes:
curl -fsSL https://hermes-agent.nousresearch.com/install.sh | bash
hermes setup
# Point Hermes at the local server:
hermes config set model.provider custom
hermes config set model.base_url http://127.0.0.1:8080/v1
hermes config set model.default EricSpencer00/chattla-20b:Q8_0

Run Hermes

hermes

Docker Model Runner
How to use EricSpencer00/chattla-20b with Docker Model Runner:
```
docker model run hf.co/EricSpencer00/chattla-20b:Q8_0
```

Lemonade

How to use EricSpencer00/chattla-20b with Lemonade:

Pull the model

# Download Lemonade from https://lemonade-server.ai/
lemonade pull EricSpencer00/chattla-20b:Q8_0

Run and chat with the model

lemonade run user.chattla-20b-Q8_0

List all available models

lemonade list

ChatTLA-20b (v20)

ChatTLA is a fine-tuned version of openai/gpt-oss-20b specialised in generating TLA+ formal specifications — the language used by AWS, Microsoft, and Intel to mathematically verify distributed systems.

Given a plain-English description of a concurrent or distributed system, ChatTLA outputs a complete, syntactically valid TLA+ module including Init, Next, Spec, TypeOK, and domain invariants, together with a TLC model-checker configuration block.

What's new in v20

v20 is the autonomous self-repair flywheel model — the result of 5 successful repair-GRPO cycles (c1 → c5) building on v15's Repair-GRPO weights. Each cycle harvests fresh failures from the production model, mines them into broken/repaired training pairs, and runs Repair-GRPO with TLC-graded reward. Promotion to production happens only when the 30-spec holdout score improves; cycles c6, c7, c8 trained on top of v20/c5 but failed to beat it (11, 9, 9 vs 12) and were not promoted.

Benchmark Results (v20, 3-shot self-correct)

Evaluated on the same 30-spec held-out suite as v14/v15, spanning communication protocols, concurrency primitives, consensus, data structures, memory/caches, mutual exclusion, classical puzzles, scheduling, transactions, and workflow state machines. Each spec gets up to 3 self-correction attempts using TLC error feedback.

Tier	Meaning
🥇 Gold	SANY parses and TLC model-checks clean
🥈 Silver	SANY parses, TLC finds violation or timeout
Bronze	SANY parse failure

Diamond tier (mutation-test caught + non-trivial invariant) was not assessed in this round; v20's evaluation reports Gold-rate only.

Per-domain breakdown (30-spec holdout, 3-shot)

Domain	Gold
communication_protocols	2/3
concurrency_primitives	2/3
consensus_election	2/3
data_structures	0/3
memory_caches	0/3
mutual_exclusion	2/3
puzzles_classical	1/3
scheduling_resources	1/3
transactions_databases	1/3
workflows_state_machines	1/3
Total	12 / 30 (40 %)

Domains where v20 reaches 2/3: communication, concurrency, consensus, mutual exclusion. Domains where v20 still fails completely: data structures, memory/caches.

Version history

Version	Suite	SANY	TLC (Gold)	Notes
v6	20-problem handcraft	4/20 (20%)	1/20 (5%)	—
v7	20-problem handcraft	6/20 (30%)	1/20 (5%)	—
v8	20-problem handcraft	8/20 (40%)	1/20 (5%)	—
v9	20-problem handcraft	6/20 (30%)	3/20 (15%)	—
v9 best-of-5 + self-correct	20-problem handcraft	16/20 (80%)	5/20 (25%)	—
v10	20-problem handcraft	6/20 (30%)	2/20 (10%)	—
v11	20-problem handcraft	6/20 (30%)	2/20 (10%)	—
v13 (SFT + DPO)	20-problem handcraft	9/20 (45%)	5/20 (25%)	trivial invariants counted as Gold
v14 (Diamond SFT)	30-spec holdout (single-shot)	16/30 (53%)	5/30 (17%)	Diamond 4/30 (13%)
v15 (Repair GRPO)	30-spec holdout (3-shot)	9/30 (30%)	9/30 (30%)	Diamond 9/30 (30%)
v20 (Flywheel c5)	30-spec holdout (3-shot)	—	12/30 (40%)	first promoted-by-holdout-gain release

Compared to v15, v20 adds 3 specs to the Gold pool (+33 % relative): the gains concentrate in communication (+2) and mutual exclusion (+2), with transactions and workflows holding ground. Data structures and memory/caches remain unsolved across both versions and are the obvious next target.

Quick Start

Ollama (recommended)

ollama run hf.co/EricSpencer00/chattla-20b

Or use the bundled Modelfile:

curl -L https://huggingface.co/EricSpencer00/chattla-20b/resolve/main/gguf/Modelfile -o Modelfile
ollama create chattla:20b -f Modelfile
ollama run chattla:20b "Write a TLA+ spec for a token ring with N nodes."

Python (transformers)

from transformers import pipeline

pipe = pipeline(
    "text-generation",
    model="EricSpencer00/chattla-20b",
    device_map="auto",
)

prompt = (
    "Write a complete TLA+ specification for a two-phase commit protocol "
    "with one coordinator and N participants."
)
result = pipe([{"role": "user", "content": prompt}], max_new_tokens=1024, return_full_text=False)
print(result[0]["generated_text"])

llama.cpp / GGUF

huggingface-cli download EricSpencer00/chattla-20b \
    gguf/chattla-20b-v20-Q8_0.gguf \
    --local-dir ./chattla

./llama-cli -m chattla/gguf/chattla-20b-v20-Q8_0.gguf \
    -n 1024 --temp 0.4 \
    -p "Write a TLA+ spec for mutual exclusion with N processes."

Model Details

Property	Value
Base model	openai/gpt-oss-20b
Parameters	20.9 B
Architecture	GptOss (sliding + full attention)
Fine-tuning method	Diamond SFT (LoRA) → Repair GRPO (LoRA) → Self-Repair Flywheel (5× LoRA) → merged
Context length	2048 (trained) / 131072 (base)
GGUF quantisation	Q8_0 (~22 GB)
Training date	April – May 2026

System prompt

You are ChatTLA, an expert at writing verified TLA+ formal specifications.
When asked to write a TLA+ spec, follow these rules exactly:
1. Start the module with ---- MODULE <ModuleName> ----
2. End with ====
3. Include EXTENDS, VARIABLES, Init, Next, and Spec operators
4. After the TLA+ module, append a TLC configuration block:
   SPECIFICATION Spec
   INVARIANT TypeOK   (if TypeOK is defined)
5. Output only valid TLA+ code. No markdown fences, no explanation outside the spec.

Training

Phase 1 — Diamond SFT (v14)

v14 was produced by the Diamond curation pipeline: candidate TLA+ specs are generated by an earlier checkpoint, then graded by a tlc_validator that checks SANY parsing, TLC state-space exploration, non-trivial invariants, and mutation-test sensitivity. Specs that survive grading are LLM-judged for chain-of-thought quality, leaving a curated training pool (209 raw → 73 curated). The model is fine-tuned with LoRA on this pool and merged.

Phase 2 — Repair GRPO (v15)

v15 applies repair-based GRPO (Group Relative Policy Optimization) on top of v14: instead of training on gold-standard specs alone, the model learns to fix broken specs using TLC error feedback as reward signal.

Trajectory collection — the v14 model generates specs for 398 problems with up to 6 repair iterations each, producing (broken, repaired) pairs scored by a multi-stage validator (SANY → TLC → Apalache → TLAPS).
Dataset filtering — pairs filtered to keep the "learnable middle" (min_before_score=0.10, max_before_score=0.80), yielding ~430 gradable pairs centered on score ≈ 0.45.
GRPO training — 300 steps, 4 generations per prompt, max 384 completion tokens. Reward is the score-improvement delta after − before, normalized by group. lr=3e-6, KL β=0.02, temp=0.5.
LoRA merge — best checkpoint (around step 140–160) merged back into full weights.

Phase 3 — Self-Repair Flywheel (v20)

v20 wraps Phase 2 in an autonomous outer loop that keeps running on the production GPU pool. Each cycle:

Failure harvest. Sample 400 random NL prompts, call the current production model, classify the outputs (Gold / Silver / Bronze).
Pair construction. Bootstrap (broken → repaired) pairs from the bronze and silver outputs; the repaired side comes from the same model under a stricter retry budget.
Repair-GRPO step. 160 steps on the harvested pairs, LoRA r=8 / α=16, lr=3e-6, KL β=0.02, on the current best merged base.
Merge → GGUF → Ollama as chattla:20b-c{N}.
Holdout eval. 30-spec 3-shot benchmark against the same held-out suite.
Promote-on-improvement. If score_cN > best_score, update the production tag chattla:20b-repair. Otherwise keep prior; the failed candidate stays as chattla:20b-c{N} for analysis.

v20 is cycle 5 of this flywheel: c1 → 5/30, c2 → 10/30, c3 → 8/30, c4 → 5/30, c5 → 12/30 (promoted). Cycles c6 (11/30), c7 (9/30), c8 (9/30) did not promote.

Training configuration (v20 incremental cycle)

Setting	Value
Method	Repair GRPO with LoRA
LoRA rank / α / dropout	8 / 16 / 0.0
GRPO steps	160 per cycle
GRPO generations / prompt	4
GRPO max completion length	384 tokens
Learning rate	3e-6
KL β	0.02
Temperature	0.5
Failures harvested / cycle	400 (filtered to ~150–250 gradable pairs)
Hardware	2× Quadro RTX 8000 (48 GB each)

DPO/KTO refinement was used in v11–v13 but was deprecated in the Diamond overhaul: 0/484 specs from those preference-trained checkpoints actually passed Diamond, indicating the model had learned TLA+ syntax without learning semantics.

Files

EricSpencer00/chattla-20b
├── README.md
└── gguf/
    ├── chattla-20b-v20-Q8_0.gguf   # Quantised GGUF for Ollama / llama.cpp (~22 GB)
    └── Modelfile                    # Ollama Modelfile

Intended Use

ChatTLA is designed for:

Rapid prototyping of TLA+ specifications from natural-language system descriptions
Educational exploration of formal methods
Assisting engineers who are learning TLA+

Not intended for: safety-critical or production verification without human review. Always validate generated specs with SANY and TLC before relying on them.

Citation

@misc{chattla2026,
  title   = {ChatTLA: Fine-tuned LLM for TLA+ Formal Specification Generation},
  author  = {Spencer, Eric},
  year    = {2026},
  url     = {https://huggingface.co/EricSpencer00/chattla-20b},
}

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Safetensors

Model size

21B params

Tensor type

BF16

Model tree for EricSpencer00/chattla-20b

Base model

openai/gpt-oss-20b

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(204)

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