Guide · 2026-05-16

Best Local LLM for Python Development — 2026 Tested

We benchmarked nine open-weight models on HumanEval+, SciCode and a 40-repo Django/FastAPI suite. One model wins outright on 24 GB VRAM.

By Mohamed Meguedmi · 11 min read

How we tested (and why this ranking differs from generic coding lists)

Most 2026 round-ups score "coding" as a single number. Python is not generic code: it leans on duck typing, decorators, async context managers, f-string debugging syntax (3.13+), and a packaging ecosystem that punishes hallucinated imports. We built a Python-only evaluation harness on top of three public datasets and one private suite:

• HumanEval+ and MBPP+ — contamination-audited versions, pass@1 with 0-shot.
• SciCode — scientific Python (numpy, scipy, sympy) — main bottleneck for ML/research users.
• Django/FastAPI 40-repo suite — 312 issues drawn from the SWE-bench-Lite Python slice, run with SWE-bench harness 2026.03.
• Latency under load — 8k-token context, batch size 1, on a single RTX 4090 (24 GB) and a dual-RTX 6000 Ada (96 GB) reference machine. Methodology is fully documented at /methodology/.

All models were served via llama.cpp build b4892 with flash-attention enabled, or vLLM 0.7.3 for the FP8/AWQ variants. Same prompts, same sampler (temperature 0.2, top-p 0.95, repeat-penalty 1.05). No re-prompts, no agent retries — first-shot accuracy only. Cost-per-million-tokens estimates use the calculator at /tools/cost-calculator/ at $0.14/kWh.

The 2026 ranking — Python-only scores

Scores are first-shot pass rates on Python-only subsets. Tokens-per-second measured at 8k context, batch 1, RTX 4090 unless the model exceeds 24 GB.

Rank	Model (quant)	VRAM	HumanEval+ Py	SciCode Py	Django/FastAPI	tok/s
1	Qwen3-Coder 32B Q4_K_M	22.1 GB	84.7%	41.2%	58.6%	38
2	DeepSeek-Coder-V3 33B Q4_K_M	23.8 GB	83.5%	39.8%	57.1%	34
3	Qwen3-Coder 14B Q5_K_M	11.4 GB	79.3%	34.0%	49.4%	62
4	GLM-5.1-Coder 28B Q4_K_M	19.7 GB	78.1%	36.5%	47.8%	41
5	DeepSeek-Coder-V2 16B MoE Q5_K_M	12.3 GB	73.2%	30.1%	43.5%	71
6	Qwen2.5-Coder 7B Q4_K_M	5.8 GB	71.9%	27.6%	38.0%	94
7	Codestral 22B v2 Q4_K_M	14.9 GB	70.4%	25.3%	41.2%	52
8	Llama 3.3 70B Q3_K_S	30.1 GB	68.7%	28.4%	39.6%	14
9	Phi-4-mini-Coder 6B Q5_K_M	4.6 GB	64.3%	21.8%	32.1%	108

Notable: Qwen3-Coder 32B is the only sub-24 GB model that crosses the 40% SciCode threshold — the empirical line above which numpy/scipy code stops requiring manual fixes for indexing and broadcasting bugs.

Verdict by hardware tier

8 GB VRAM (RTX 4060, M2 8 GB, Steam Deck OLED)

Run Qwen2.5-Coder 7B Q4_K_M. It still leads its tier by 7 points on HumanEval+ and remains the only 7B that handles Python 3.12+ match statements without spurious case _: fallthroughs. Skip Phi-4-mini-Coder unless RAM is critical — it hallucinates pydantic.v1 imports 12% of the time.

12-16 GB VRAM (RTX 4070 Ti, RTX 5070, M3 Pro 18 GB)

Run Qwen3-Coder 14B Q5_K_M. It is 6 points ahead of DeepSeek-Coder-V2 16B on Python and ships with a 256k YaRN context that genuinely holds coherence past 100k tokens — verified on a 78k-token Django codebase walkthrough. DeepSeek-Coder-V2 MoE remains the throughput champion (71 tok/s) if you serve more than one developer.

24 GB VRAM (RTX 4090, RTX 5090, M3 Max 36 GB)

Run Qwen3-Coder 32B Q4_K_M. This is the sweet spot for solo Python development in 2026. DeepSeek-Coder-V3 33B is 1.2 points behind on Python but pulls ahead for multi-language and agentic workflows — pick it if you alternate between Python and Rust/Go.

48-96 GB VRAM (dual RTX 6000 Ada, M3 Ultra 96/192 GB, Strix Halo 128 GB)

Run Qwen3-Coder 32B FP16 or the unquantized DeepSeek-Coder-V3 33B. The FP16 jump buys 1.4 points on SciCode and noticeably cleaner type-hint generation, but it is a luxury — Q4_K_M is within rounding distance for everyday work.

Why Qwen3-Coder 32B wins for Python specifically

Three measurable reasons:

1. Training mix. The official model card documents 2.4T tokens of code with an explicit Python overweight (38%) and a fill-in-the-middle objective trained on real GitHub PR diffs. The 2025 Qwen2.5-Coder line shared the architecture but not the diff-based training.
2. Tokenizer. Qwen3's tokenizer encodes the four-space Python indent as a single token, which is why it generates clean nested code at 38 tok/s rather than burning steps on whitespace. DeepSeek-Coder-V3 uses a similar trick but loses ~10% throughput on deeply indented async code.
3. Type-hint awareness. On our 312-issue suite, Qwen3-Coder produced syntactically valid PEP 695 generic type aliases on 91% of attempts. The next best, DeepSeek-Coder-V3, scored 84%. Llama 3.3 70B scored 61% — it still emits 2024-era TypeVar boilerplate.

Setup — 6 minutes to a working VS Code assistant

The fastest path in 2026 is ollama + Continue.dev. Below is the recipe the editorial team uses for the 24 GB tier.

# 1. Install ollama (Linux/macOS)
curl -fsSL https://ollama.com/install.sh | sh

# 2. Pull Qwen3-Coder 32B (4-bit, ~22 GB)
ollama pull qwen3-coder:32b-instruct-q4_K_M

# 3. Tune context for Python repos (default 8k is too small)
cat > Modelfile <<'EOF'
FROM qwen3-coder:32b-instruct-q4_K_M
PARAMETER num_ctx 32768
PARAMETER temperature 0.2
PARAMETER top_p 0.95
PARAMETER repeat_penalty 1.05
SYSTEM """You are a senior Python engineer. Prefer type hints (PEP 695), 
f-string debug syntax (3.13+), pathlib over os.path, and structural pattern 
matching. Never invent imports."""
EOF
ollama create py-coder -f Modelfile

# 4. Install Continue.dev in VS Code, point it at:
#    provider: ollama, model: py-coder, apiBase: http://localhost:11434

For agentic workflows (LangGraph, smolagents, OpenAI-compatible tool calls), serve via vLLM instead — it adds proper tool_choice handling that Ollama still routes through Jinja templates. See the vLLM supported-models list for the AWQ variant.

Cost — local vs Claude Sonnet 4.6 API

Assuming a Python developer who consumes ~4M input + 1.2M output tokens per workday (measured median across the editorial team), amortized over a 36-month hardware lifecycle and $0.14/kWh:

Setup	Hardware cost	Power	$ / day equiv.	$ / year
RTX 4090 + Qwen3-Coder 32B	$1,799	340 W avg	$2.85	$713
M3 Max 36 GB + Qwen3-Coder 32B	$3,499	62 W avg	$3.50	$876
Claude Sonnet 4.6 API	$0	—	$15.60	$3,900
GPT-5.1-mini API	$0	—	$9.20	$2,300

Break-even for the RTX 4090 build is ~7 months at this usage. Recompute for your own token volume with the cost calculator; the team behind it is documented at /about/, and full benchmark data is also available via the public BestLLMfor API (CC BY 4.0) and the open-source quelllm-mcp server for direct integration with your IDE or CI. French readers can cross-check methodology on quelllm.fr.

What we don't recommend in 2026

• Codestral 22B v2 — regressed on Python 3.13 syntax; still excellent for non-Python FIM in JetBrains IDEs but no longer the default.
• Llama 3.3 70B — a generalist that pays the Python tax. Three points behind Qwen3-Coder 14B at four times the VRAM.
• Gemma 3 27B — strong reasoning, but a tokenizer that fragments Python indent into 3+ tokens drops throughput below usable for inline completion.
• GPT-OSS-120B Q3 — promising for agentic code review but too slow (9 tok/s on 96 GB) for interactive Python work.

If you can only remember one rule for 2026: a Python-tuned 14-32B Qwen3-Coder beats every general-purpose 70B model that fits the same VRAM budget. Specialization wins.

Final verdict

Use case	Pick	Why
Solo Python dev, 24 GB GPU	Qwen3-Coder 32B Q4_K_M	Highest first-shot pass rate on every Python benchmark we ran.
Laptop / 16 GB unified memory	Qwen3-Coder 14B Q5_K_M	Best Python-per-gigabyte; genuine 256k context.
Budget GPU / 8 GB	Qwen2.5-Coder 7B Q4_K_M	Only 7B that handles modern Python syntax cleanly.
Agentic Python (LangGraph, smolagents)	DeepSeek-Coder-V3 33B	Best tool-call accuracy in our SWE-bench Python subset.
Multi-developer team server	DeepSeek-Coder-V2 16B MoE	71 tok/s and batchable on a single 24 GB card.