{"slug": "what-a-coding-agent-actually-costs-per-month-by-model-2026", "title": "What a coding agent actually costs per month, by model (2026)", "summary": "A developer's analysis of coding agent costs reveals a 63× price spread across models for the same workload, with output token pricing being the dominant factor. For a busy single-developer agent consuming ~90M input and ~25M output tokens per month, costs range from $19 (Qwen3.5-Flash) to $1,200 (GPT-5.6 Sol). The analysis emphasizes that output price, not input, drives the bill for token-hungry coding agents.", "body_md": "\"Which model should I run my coding agent on?\" almost always turns into a price question once the first invoice lands. Coding agents are *token-hungry* — they read whole files, reason across a repo, and emit long diffs — so the model you pick shows up on your bill in a big way.\n\nHere's the part nobody tells you: for a coding workload, **output price dominates**. An agent that burns ~90M input and ~25M output tokens a month pays for those 25M output tokens at rates that swing from $0.28 to $30 per million. That single number decides most of your bill.\n\nBelow is one fixed workload — **~90M input + ~25M output tokens/month** (a busy single-developer coding agent) — priced against each model's *current, official* API rates. Nothing here is invented; every figure is pulled live from [AI Model Watch](https://aimodelwatch.dev), which tracks these prices daily from provider pricing pages.\n\n| Model | Input $/M | Output $/M | Est. monthly cost |\n|---|---|---|---|\n| Qwen3.5-Flash | $0.10 | $0.40 | $19 |\n| DeepSeek-V4-Flash | $0.14 | $0.28 | $20 |\n| Codestral (v25.08) | $0.30 | $0.90 | $50 |\n| Gemini 3.1 Flash-Lite | $0.25 | $1.50 | $60 |\n| DeepSeek-V4-Pro | $0.435 | $0.87 | $61 |\n| Mistral Large 3 | $0.50 | $1.50 | $83 |\n| Kimi K2.7 Code | $0.95 | $4.00 | $186 |\n| Qwen3-Max | $1.20 | $6.00 | $258 |\n| Grok 4.5 | $2.00 | $6.00 | $330 |\n| Gemini 3.5 Flash | $1.50 | $9.00 | $360 |\n| GPT-5.4 | $2.50 | $15.00 | $600 |\n| GPT-5.6 Terra | $2.50 | $15.00 | $600 |\n| Claude Sonnet 5 | $3.00 | $15.00 | $645 |\n| Claude Opus 4.8 | $5.00 | $25.00 | $1,075 |\n| GPT-5.6 Sol | $5.00 | $30.00 | $1,200 |\n\nThat's a **63× spread** — $19/mo to $1,200/mo — for the *same* number of tokens. The choice of model, not the amount of work, is what moves the bill an order of magnitude.\n\n**1. Output tokens are where coding agents bleed.** Compare DeepSeek-V4-Flash ($0.28 out) to Claude Sonnet 5 ($15 out): a 54× output-price gap that a chat benchmark, which weights input heavily, would hide. Agents *write* a lot, so weight the output rate accordingly.\n\n**2. \"Cheap\" and \"specialist\" aren't the same axis.** The two cheapest here are general-purpose small models (Qwen3.5-Flash, DeepSeek-V4-Flash), not the code-branded ones. Codestral and Kimi K2 Code are tuned for coding, but you pay for the tuning. Whether that tuning earns its 4–9× premium depends on your task — benchmark it on *your* repo, not on a leaderboard.\n\n**3. The frontier tier is a different budget entirely.** Opus 4.8 and GPT-5.6 Sol land above $1,000/mo on this workload. They may well close the loop in fewer iterations — a frontier model that one-shots a task can be cheaper in practice than a cheap model that needs five tries. But that's an *efficiency* argument you have to verify, not assume.\n\nThe numbers above are current as of publication, but this corner of the market moves weekly: new coding models ship, prices get cut, and preview tiers graduate or get retired. If you're running an agent in production, a 2× output-price change is a real budget event.\n\nAI Model Watch tracks every LLM's price, context window and deprecation status daily from official sources, and sends a **free email alert** the moment a model you rely on changes price or gets an end-of-life date. If you'd rather not re-check a pricing page every week: ** aimodelwatch.dev**.\n\n*Full ranked coding-cost table and methodology: aimodelwatch.dev/guides/cheapest-llm-for-coding*", "url": "https://wpnews.pro/news/what-a-coding-agent-actually-costs-per-month-by-model-2026", "canonical_source": "https://dev.to/khavel/what-a-coding-agent-actually-costs-per-month-by-model-2026-3ac9", "published_at": "2026-07-16 11:44:07+00:00", "updated_at": "2026-07-16 12:03:58.828069+00:00", "lang": "en", "topics": ["artificial-intelligence", "large-language-models", "ai-tools", "developer-tools", "ai-infrastructure"], "entities": ["Qwen3.5-Flash", "DeepSeek-V4-Flash", "Codestral", "Gemini 3.1 Flash-Lite", "Mistral Large 3", "Claude Sonnet 5", "GPT-5.6 Sol", "AI Model Watch"], "alternates": {"html": "https://wpnews.pro/news/what-a-coding-agent-actually-costs-per-month-by-model-2026", "markdown": "https://wpnews.pro/news/what-a-coding-agent-actually-costs-per-month-by-model-2026.md", "text": "https://wpnews.pro/news/what-a-coding-agent-actually-costs-per-month-by-model-2026.txt", "jsonld": "https://wpnews.pro/news/what-a-coding-agent-actually-costs-per-month-by-model-2026.jsonld"}}