Compare to
Discover how Anthropic's Claude 2.1 and Open AI's o3 stack up against each other in this comprehensive comparison of two leading AI
language models.
Released in November 2024 and April 2025 respectively, these models represent significant advancements in artificial intelligence,
with Claude 2.1 offering a 200,000-token context
window and o3 featuring a 200,000-token
capacity. Their distinct approaches to natural language processing are reflected in their
benchmark performances, with Claude 2.1 achieving null% on MMLU and o3 scoring Unknown%, making this comparison essential
for developers and organizations seeking the right AI solution for their specific needs.
Models Overview
 Claude 2.1 |  o3 | |
|---|---|---|
Provider Company that developed the model | Anthropic | Open AI |
Context Length Maximum number of tokens the model can process | 200K | 200K |
Maximum Output Maximum number of tokens the model can generate in a single response | Unknown | 100K |
Release Date Date when the model was released | 23-11-2024 | 16-04-2025 |
Knowledge Cutoff Training data cutoff date | Early 2023 | June 2024 |
Open Source Whether the model's code is open-source | FALSE | FALSE |
API Providers API providers that offer access to the model | Anthropic API, Vertex AI, AWS Bedrock | OpenAI API |
Pricing Comparison
Compare the pricing of Anthropic's Claude 2.1 and Open AI's o3 to determine the most cost-effective solution for your AI needs.
| Claude 2.1 | o3 | |
|---|---|---|
Input Cost Cost per million input tokens | $8 / 1M tokens | $10 / 1M tokens |
Output Cost Cost per million tokens generated | $24 / 1M tokens | $40 / 1M tokens |
Comparing Benchmarks and Performance
Compare the performances of Anthropic's Claude 2.1 and Open AI's o3 on industry benchmarks. This section provides a detailed comparison on MMLU, MMMU, HumanEval, MATH and other key benchmarks.
| Claude 2.1 | o3 | |
|---|---|---|
MMLU Evaluating LLM knowledge acquisition in zero-shot and few-shot settings. | Benchmark not available | Benchmark not available |
MMMU A wide ranging multi-discipline and multimodal benchmark. | Benchmark not available | 82.9% |
HellaSwag A challenging sentence completion benchmark. | Benchmark not available | Benchmark not available |
GSM8K Grade-school math problems benchmark. | Benchmark not available | Benchmark not available |
HumanEval A benchmark to measure functional correctness for synthesizing programs from docstrings. | Benchmark not available | Benchmark not available |
MATH Benchmark performance on Math problems ranging across 5 levels of difficulty and 7 sub-disciplines. | Benchmark not available | Benchmark not available |
