Long-context research cost drivers
Long prompts can approach model context limits or pricing thresholds, so per-request input size matters more than monthly token totals alone.
Workload cost scenario
Long-Context Research API Cost Calculator
Compare LLM API cost for research prompts that combine many source documents with a detailed generated answer.
Research and analysis teams working with large source packets.
Lowest tracked estimate
$31.30
Gemini 2.5 Flash-Lite for the current assumptions
Lowest cost does not mean best model. Test output quality, latency, retries, and reliability on your own workload.
Cost comparison
Estimated monthly cost by model
Comparing 19 models that fit the initial input length.
| Model | Provider | Input cost | Output cost | Monthly estimate | Context usage |
|---|---|---|---|---|---|
| Gemini 2.5 Flash-Lite | $27.30 | $4.00 | $31.30 | 14.3% | |
| DeepSeek V4 Flash non-thinking | DeepSeek | $37.88 | $2.80 | $40.68 | 15.0% |
| gpt-5.4-nano | OpenAI | $54.60 | $12.50 | $67.10 | 37.5% |
| Gemini 3.1 Flash-Lite | $68.25 | $15.00 | $83.25 | 14.3% | |
| Gemini 2.5 Flash | $81.90 | $25.00 | $106.90 | 14.3% | |
| deepseek-v4-pro | DeepSeek | $117.56 | $8.70 | $126.26 | 15.0% |
| Gemini 3 Flash Preview | $136.50 | $30.00 | $166.50 | 14.3% | |
| gpt-5.4-mini | OpenAI | $204.75 | $45.00 | $249.75 | 37.5% |
| Claude Haiku 4.5 | Anthropic | $273.00 | $50.00 | $323.00 | 75.0% |
| gpt-5.6-luna | OpenAI | $273.00 | $60.00 | $333.00 | 14.3% |
| Gemini 2.5 Pro | $341.25 | $100.00 | $441.25 | 14.3% | |
| Gemini 3.5 Flash | $409.50 | $90.00 | $499.50 | 14.3% | |
| Claude Sonnet 5 | Anthropic | $546.00 | $100.00 | $646.00 | 15.0% |
| Gemini 3.1 Pro Preview | $546.00 | $120.00 | $666.00 | 14.3% | |
| gpt-5.6-terra | OpenAI | $682.50 | $150.00 | $832.50 | 14.3% |
| Claude Sonnet 4.6 | Anthropic | $819.00 | $150.00 | $969.00 | 15.0% |
| Claude Opus 4.8 | Anthropic | $1,365.00 | $250.00 | $1,615.00 | 15.0% |
| gpt-5.6-sol | OpenAI | $1,365.00 | $300.00 | $1,665.00 | 14.3% |
| Claude Fable 5 | Anthropic | $3,000.00 | $500.00 | $3,500.00 | 15.0% |
What to measure
- Check each model's context window before comparing cost.
- Track citations and source coverage separately from price.
- Summarize or retrieve only relevant sections when full-context quality is unnecessary.
Estimate boundary: Models whose tracked context window is below the scenario input are excluded from the compatible-model table.
View pricing sources
OpenAI model pricingHigh confidenceChecked 2026-07-13
Tracked prices for included OpenAI models are checked against official provider documentation.
Anthropic model pricingHigh confidenceChecked 2026-07-12
Tracked prices for included Anthropic models are checked against official provider documentation.
Google model pricingHigh confidenceChecked 2026-07-14
Tracked prices for included Google models are checked against official provider documentation.
DeepSeek model pricingHigh confidenceChecked 2026-07-12
Tracked prices for included DeepSeek models are checked against official provider documentation.
Anthropic model pricingHigh confidenceChecked 2026-07-14
Tracked prices for included Anthropic models are checked against official provider documentation.