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Verified against OpenAI Official Pricing
OpenAIreasoningGenerally Available

OpenAI o3 Token Counter & Cost Calculator

Next-generation reasoning model optimized for mathematical rigor and complex software engineering

Standard Input / 1M
$2.00
Prompt tokens
Cached Input / 1M
$1.00
Prompt caching rate
Output / 1M
$8.00
Generation completion
Context Window
200k
Max out: 100k

Interactive Cost & Token Simulator for OpenAI o3

Live Calculation
Input Tokens2,500
Output Tokens800
Requests / Day5,000
Prompt Caching Ratio (50%)$1/M cached rate
Cost / Request$0.0102
Daily Spend (5,000 reqs)$50.75
Monthly Run-Rate (30d)$1,522.50

Standard Workload Cost Scenarios

ScenarioInput TokensOutput TokensUncached CostWith Prompt Caching
Short Chat Query1,000500$0.00600$0.00500
Document Summarization10,0002,000$0.0360$0.0260
Codebase & Context Analysis100,00020,000$0.3600$0.2600
Batch Corpus Processing1,000,000100,000$2.80$1.80
Technical Architecture & Pricing VerificationVerified: September 8, 2026
Model ArchitectureOpenAI o3
Provider OrganizationOpenAI
Tokenizer EncodingOpenAI o200k_base (200k vocabulary)
API ConnectivityOpenAI Chat Completions API with reasoning_effort parameter ('low', 'medium', 'high').
Batch API 50% DiscountSupported (50% off input & output)
Tier 1 Rate Quota500 RPM · 100k TPM
Blended 3:1 Cost / 1M Tokens$3.50
Deep reasoning model. Reasoning tokens are billed as output tokens at $60.00/1M.OpenAI Official Pricing

Verified Pricing History

June 2026: $15/M input · $60/M output ($7.5/M cached)
OpenAI o3 general availability release.

When to Choose OpenAI o3

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 o3

How much does 1 million tokens cost with OpenAI o3?

For OpenAI o3, 1 million input tokens costs $2.00, while 1 million output tokens costs $8.00. If using prompt caching, repetitive input prefixes are discounted to $1.00 per million.

What is the context window for OpenAI o3?

OpenAI o3 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 o3 use?

OpenAI o3 utilizes the OpenAI o200k_base (200k vocabulary). Token counting on TokenMath runs client-side to ensure maximum privacy.

Does OpenAI o3 support prompt caching discounts?

Yes. OpenAI o3 supports prompt caching with a cached input rate of $1.00/1M (saving up to 50% on repeated input context).