OpenAI vs Anthropic Pricing
Per-million-token pricing for OpenAI and Anthropic, with side-by-side flagship models, cheapest tiers, and context windows. Pricing data syncs weekly from the open-source litellm catalog — last updated May 4, 2026.
Who wins on what
Cheapest input tokens
$0.03/1MOpenAI
gpt-oss-20b — $0.03/1M input
Cheapest output tokens
$0.14/1MOpenAI
gpt-oss-20b — $0.14/1M output
Longest context window
2.0MOpenAI
gpt-5.4 (>272K context length) — 2.0M input tokens
Lowest average output cost
$23.87/1MOpenAI
Provider-wide average across 153 models
Largest model catalog
153 modelsOpenAI
More options to match cost vs capability
Side-by-side
OpenAI
Cheapest input
$0.030
gpt-oss-20b
Cheapest output
$0.140
gpt-oss-20b
Longest context
2.0M
gpt-5.4 (>272K context length)
Avg output / 1M
$23.87
Across catalog
| Model | In/1M | Out/1M | Ctx |
|---|---|---|---|
| o1-pro | $150.00 | $600.00 | 200K |
| gpt-5.4-pro (>272K context length) | $60.00 | $270.00 | 2.0M |
| gpt-5.5-pro (>272K context length) | $60.00 | $270.00 | 2.0M |
| gpt-5.4-pro (<272K context length) | $30.00 | $180.00 | 272K |
| gpt-5.5-pro (<272K context length) | $30.00 | $180.00 | 272K |
| gpt-oss-20b | $0.030 | $0.140 | 131K |
Anthropic
Cheapest input
$0.250
Claude 3 Haiku
Cheapest output
$1.25
Claude 3 Haiku
Longest context
1.0M
Claude 4 Sonnet (2025-05-14)
Avg output / 1M
$25.94
Across catalog
| Model | In/1M | Out/1M | Ctx |
|---|---|---|---|
| Claude 3 Opus (2024-02-29) | $15.00 | $75.00 | 200K |
| Claude 4 Opus (2025-05-14) | $15.00 | $75.00 | 200K |
| Claude Opus 4 | $15.00 | $75.00 | 200K |
| Claude Opus 4 (2025-05-14) | $15.00 | $75.00 | 200K |
| Claude Opus 4.1 | $15.00 | $75.00 | 200K |
| Claude 3 Haiku | $0.250 | $1.25 | 200K |
All prices in USD per 1 million tokens. Showing top 6 models per provider, sorted by output cost.
Run the numbers for your workload
Calcaas multiplies per-token costs by your real usage patterns — inputs, outputs, retries, and conversation history — across both providers in one model.