LLMCost

Anthropic: Claude Opus 5 vs OpenAI: o3 Mini

On input price, OpenAI: o3 Mini is ~4.5× cheaper. Verified 2026-10-21.

Anthropic: Claude Opus 5 $5.00/$25.00vsOpenAI: o3 Mini $1.10/$4.40

Verdict

On blended price (3:1 input:output), OpenAI: o3 Mini is ~5.2× cheaper ($1.10/$4.40 vs $5.00/$25.00 per 1M tokens).

Pricing

Per-million-token list prices, verified 2026-10-21. Green marks the better value.

MetricAnthropic: Claude Opus 5OpenAI: o3 Mini
Input / 1M$5.00$1.10
Output / 1M$25.00$4.40
Cache read / 1M$0.500$0.550
Blended (3:1)$10.00/1M$1.93/1M
Estimated monthly costAnthropic: Claude Opus 5OpenAI: o3 Mini
Chatbot10,000 reqs · 800/400 tok$140.00$26.40
Coding agent5,000 reqs · 8000/2000 tok$450.00$88.00
RAG pipeline30,000 reqs · 4000/500 tok$975.00$198.00

Plug in your own numbers in the calculator, or paste a real bill into the Bill Shredder.

Specifications & capabilities

MetricAnthropic: Claude Opus 5OpenAI: o3 Mini
Context window1M200K
Max output128K100K
Vision input✓–
Tool calling✓✓
Reasoning✓✓

Quality

Intelligence Index by Artificial Analysis (independent evaluations, 0–100).

Verified intelligence scores aren't available for both models yet. See the full leaderboard.

Performance

Measured by Artificial Analysis on live endpoints.

Output speed — higher is better
Anthropic: Claude Opus 585 tok/s
OpenAI: o3 Mini120 tok/s
Latency (TTFT) — lower is better
Anthropic: Claude Opus 51,200 ms
OpenAI: o3 Mini800 ms
MetricAnthropic: Claude Opus 5OpenAI: o3 Mini
Cost per task$0.000025$0.000008

Provider

Infrastructure metrics for the organizations behind these models.

MetricAnthropicOpenAI
Listed endpoints812
Reliability99.8%99.9%
Avg latency520 ms450 ms
Pricing tiersstandard, batchstandard, batch, provisioned

Full details: Anthropic: Claude Opus 5 pricing · OpenAI: o3 Mini pricing