{T}
TokenMath.net
Verified against OpenAI Official Pricing
OpenAIreasoningGenerally Available

OpenAI o1 Token Counter & Cost Calculator

Foundational deliberation model for complex multi-step science, coding, and mathematical reasoning

Standard Input / 1M
$15.00
Prompt tokens
Cached Input / 1M
$7.50
Prompt caching rate
Output / 1M
$60.00
Generation completion
Context Window
200k
Max out: 100k
API & Developer Integration Details
generally available
API Model Stringo1-2024-12-17
Provider & FamilyOpenAI (o200k_base)
Prompt Caching RulesSupported
Long-Context TiersStandard flat rate throughout full window
First-party audit timestamp: 2026-09-15 15:00 UTCOfficial Documentation

Interactive Cost & Token Simulator for OpenAI o1

Live Calculation
Input Tokens2,500
Output Tokens800
Requests / Day5,000
Prompt Caching Ratio (50%)$7.5/M cached rate
Cost / Request$0.0761
Daily Spend (5,000 reqs)$380.63
Monthly Run-Rate (30d)$11,418.75

Standard Workload Cost Scenarios

ScenarioInput TokensOutput TokensUncached CostWith Prompt Caching
Short Chat Query1,000500$0.0450$0.0375
Document Summarization10,0002,000$0.2700$0.1950
Codebase & Context Analysis100,00020,000$2.70$1.95
Batch Corpus Processing1,000,000100,000$21.00$13.50
Technical Architecture & Pricing VerificationVerified: 2026-09-15 15:00 UTC
Model ArchitectureOpenAI o1
Provider OrganizationOpenAI
Tokenizer EncodingOpenAI o200k_base (200k vocabulary)
API ConnectivityOpenAI Chat Completions API with reasoning_effort configuration.
Batch API 50% DiscountSupported (50% off input & output)
Tier 1 Rate Quota500 RPM · 100k TPM
Blended 3:1 Cost / 1M Tokens$26.25
Pioneering reasoning model ($15.00/1M in, $60.00/1M out). 50% prompt caching discount.OpenAI Official Pricing

Verified Pricing History

September 2026: $15/M input · $60/M output ($7.5/M cached)
Verified OpenAI o1 official API rates.

When to Choose OpenAI o1

Ideal for production workloads demanding reasoning capabilities, deep context depth (200k tokens), and reliability from OpenAI. Excellent when predictable tokenomics and prompt caching support are paramount.

When Another Model May Be Better

If your use-case requires sub-second streaming latency or ultra-high frequency classification at micro-cent pricing, consider lighter budget options such as Gemini Flash-Lite or Claude Haiku. For deep formal logic, consider dedicated reasoning models like o3.

Frequently Asked Questions About OpenAI o1

How much does 1 million tokens cost with OpenAI o1?

For OpenAI o1, 1 million input tokens costs $15.00, while 1 million output tokens costs $60.00. If using prompt caching, repetitive input prefixes are discounted to $7.50 per million.

What is the context window for OpenAI o1?

OpenAI o1 features a maximum context window of 200,000 tokens (~150,000 words), with a maximum output limit of 100,000 tokens per completion.

Which tokenizer does OpenAI o1 use?

OpenAI o1 utilizes the OpenAI o200k_base (200k vocabulary). Token counting on TokenMath runs client-side to ensure maximum privacy.

Does OpenAI o1 support prompt caching discounts?

Yes. OpenAI o1 supports prompt caching with a cached input rate of $7.50/1M (saving up to 50% on repeated input context).