Agent Run Cost Planner
Estimate the cost of a multi-step agent run where the context grows every step, across every model on our price list.
The starting numbers are placeholders, not measurements: replace them with token counts from your own logs.
| Model | Per run | Per month | Context | Fits? |
|---|---|---|---|---|
| Claude Opus 5.5 Anthropic · $4/$20 per 1M | $0.7416 | $742 | 1M | Yes |
| GPT-6 Astra OpenAI · $10/$50 per 1M | $1.85 | $1854 | 1.05M | Yes |
| GPT-6.1 Sol OpenAI · $2/$10 per 1M | $0.3708 | $371 | 1.05M | Yes |
| Claude Sonnet 5.5 Anthropic · $2/$10 per 1M | $0.3708 | $371 | 1M | Yes |
| GPT-6.1 Terra OpenAI · $1/$5 per 1M | $0.1854 | $185 | 1.05M | Yes |
| Gemini 4 Argon Google · $2/$10 per 1M | $0.3708 | $371 | 1M | Yes |
| Claude Fable 5.1 Anthropic · $10/$50 per 1M | $1.85 | $1854 | 1M | Yes |
| Muse Wonder Meta · $4/$20 per 1M | $0.7416 | $742 | 1.05M | Yes |
| Claude Haiku 5.5 Anthropic · $0.1/$0.5 per 1M | $0.0185 | $18.54 | 1M | Yes |
| Grok 4.7 xAI · $2/$6 per 1M | $0.3516 | $352 | 500K | Yes |
| DeepSeek V4.1 Flash (1017) DeepSeek · $0.3/$1.2 per 1M | $0.0542 | $54.18 | 1M | Yes |
| Gemini 3.8 Flash Google · $0.75/$3.75 per 1M | $0.1391 | $139 | 1M | Yes |
| GPT-6 Luna OpenAI · $0.1/$0.5 per 1M | $0.0185 | $18.54 | 1.05M | Yes |
| DeepSeek V4 Pro (0813) DeepSeek · $1.32/$3.96 per 1M | $0.2321 | $232 | 1M | Yes |
How this is calculated
Step 1 sends the fixed prompt. Every later step sends the fixed prompt plus everything added so far (each earlier tool result and model output), so input tokens grow with every step: input = steps × fixed + (added + output) × steps × (steps − 1) ÷ 2. Output = steps × output per step. Cost = (input × input price + output × output price) ÷ 1,000,000. This is an upper bound for providers that discount cached input, and it ignores batch discounts, reasoning tokens billed as output, tool fees and any context trimming. Prices are standard list prices from each provider's official page (last verified 2026-11-09); see the model price list for sources.
Related guide: Cheapest LLM APIs for agents
Get new agent tools daily
One short email each morning. New tools, MCP servers and frameworks. No spam.
More tools
Token & Cost Estimator
Know what every call costs.
JSON Schema → Tool Definition
One schema. Every format.
System Prompt Linter
Prompts, without the guesswork.
MCP Server Config Generator
Wire up MCP in seconds.
Cron Expression Explainer
Schedules you can read.
Regex Tester for Agent Outputs
Parse model output reliably.
MCP Inspector
Call a remote MCP server from the browser.
TDQS Hard-Gate Lint
Deterministic tool-definition checks.