Overage / Compare / LLM APIs
Anthropic API vs OpenAI API pricing Monthly cost at three volumes Monthly cost of Anthropic API and OpenAI API at three volumes and at your own Volume Anthropic APICheapest model Claude Fable 5.1 Claude Opus 5.5 Claude Sonnet 5.5 Claude Haiku 5.5 (prompt <=100K tokens) Claude Haiku 5.5 (prompt >100K tokens) Claude Mythos 5.1 Claude Fable 5 Claude Mythos 5 Claude Opus 5 Claude Opus 4.8 Claude Opus 4.7 Claude Opus 4.6 Claude Opus 4.5 Claude Opus 4.1 Claude Opus 4 Claude Sonnet 5 Claude Sonnet 4.6 Claude Sonnet 4.5 Claude Sonnet 4 Claude Haiku 4.5 Claude Haiku 3.5 OpenAI APICheapest model gpt-6-astra gpt-6.1-sol gpt-6-luna gpt-5.6-sol gpt-5.6-cyber gpt-rosalind-research gpt-rosalind-discovery chat-latest gpt-5.3-codex gpt-4o-transcribe gpt-4o-mini-transcribe small1M input, 200K output $0.20 / moClaude Haiku 5.5 (prompt <=100K tokens) $0.20 / mogpt-6-luna growing50M input, 10M output $10 / moClaude Haiku 5.5 (prompt <=100K tokens) $10 / mogpt-6-luna scale1B input, 200M output $200 / moClaude Haiku 5.5 (prompt <=100K tokens) $200 / mogpt-6-luna your volumeset above $10 / moClaude Haiku 5.5 (prompt <=100K tokens) $10 / mogpt-6-luna
Each cell is the cheapest feasible plan, or the chosen model, at that volume, from the shared Overage cost function. "Cheapest model" only considers models with both an input and an output price listed. Volumes are example scenarios you can edit.
Cheapest model per service, USD per 1M tokens Cheapest priced model of each service Service Cheapest model Input Output Models listed Anthropic API Claude Haiku 5.5 (prompt <=100K tokens) $0.10 $0.50 21 OpenAI API gpt-6-luna $0.10 $0.50 11
Every model Every model of both services, USD per 1M tokens Model Service Input Output Claude Haiku 5.5 (prompt <=100K tokens) Anthropic API $0.10 $0.50 Claude Haiku 5.5 (prompt >100K tokens) Anthropic API $0.50 $2.50 Claude Haiku 3.5 Anthropic API $0.80 $4 Claude Haiku 4.5 Anthropic API $1 $5 Claude Sonnet 5.5 Anthropic API $2 $10 Claude Sonnet 5 Anthropic API $2 $10 Claude Sonnet 4.6 Anthropic API $3 $15 Claude Sonnet 4.5 Anthropic API $3 $15 Claude Sonnet 4 Anthropic API $3 $15 Claude Opus 5.5 Anthropic API $4 $20 Claude Opus 5 Anthropic API $5 $25 Claude Opus 4.8 Anthropic API $5 $25 Claude Opus 4.7 Anthropic API $5 $25 Claude Opus 4.6 Anthropic API $5 $25 Claude Opus 4.5 Anthropic API $5 $25 Claude Fable 5.1 Anthropic API $10 $50 Claude Mythos 5.1 Anthropic API $10 $50 Claude Fable 5 Anthropic API $10 $50 Claude Mythos 5 Anthropic API $10 $50 Claude Opus 4.1 Anthropic API $15 $75 Claude Opus 4 Anthropic API $15 $75 gpt-6-luna OpenAI API $0.10 $0.50 gpt-4o-mini-transcribe OpenAI API $1.25 $5 gpt-5.3-codex OpenAI API $1.75 $14 gpt-6.1-sol OpenAI API $2 $10 gpt-4o-transcribe OpenAI API $2.50 $10 gpt-5.6-sol OpenAI API $4 $20 gpt-rosalind-research OpenAI API $5 $25 gpt-rosalind-discovery OpenAI API $5 $25 chat-latest OpenAI API $5 $30 gpt-6-astra OpenAI API $10 $50 gpt-5.6-cyber OpenAI API $12.50 $75
Models are compared by name and price, never by position. Pick one model per service, or "Cheapest model", in the cost table above.
Tightest rate limit Tightest documented rate limit of each service Measure Anthropic API OpenAI API Tightest limit unlisted unlisted
Changes in the last 90 days Before not listed → After $2 input, $10 output per 1M tokens new