Anthropic Claude Opus 5 (200k) vs OpenAI GPT-5.6 Mini (1M)
Side-by-side comparison of pricing, context window, capabilities, and a real-cost sample workload.
Option A
Anthropic Claude Opus 5 (200k)
by Anthropic
Context:200K
Input:$5.00 / 1M
Output:$25.00 / 1M
Released:2026-07
Option B
OpenAI GPT-5.6 Mini (1M)
by OpenAI
Context:1M
Input:$0.60 / 1M
Output:$3.60 / 1M
Released:2026-07
Detailed Comparison
| Dimension | Anthropic Claude Opus 5 (200k) | OpenAI GPT-5.6 Mini (1M) |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Context window Winner | 200K | 1M |
| Input price ($/1M) Winner | $5.00 | $0.60 |
| Output price ($/1M) Winner | $25.00 | $3.60 |
| Sample workload cost Winner 1M input + 500K output tokens | $17.50 | $2.40 |
| Released TieTie | 2026-07 | 2026-07 |
| Tokenizer | claude-4 | o200k_base |
The verdict
On the dimensions we measured, OpenAI GPT-5.6 Mini (1M) wins more often - particularly on cost-effectiveness for a typical 1M+0.5M workload.
Anthropic Claude Opus 5 (200k) - Key features
Anthropic's flagship Opus-class model for July 2026. Opus 5 pairs Mythos-class reasoning with the Opus price point, adds adaptive effort control and a hardened long-horizon agent loop that holds context across day-long tasks.
- Adaptive effort control (low to max)
- Best-in-class agentic coding
- Compaction-aware 200K context
- Native tool search and skills
- Interleaved thinking with tool use
OpenAI GPT-5.6 Mini (1M) - Key features
The cost tier of GPT-5.6. Mini keeps the same tokenizer and tool interface as the full model, trading depth for roughly an eighth of the price and noticeably lower latency.
- ~1M token context window
- Very low cost per million tokens
- Same tool interface as GPT-5.6
- Fast streaming
- Batch discount available
How to choose
- Pick the cheaper model if your workload is mostly straightforward classification, extraction, or summarization.
- Pick the bigger context if you process long documents, large codebases, or multi-document research.
- Pick the more recent release if you need state-of-the-art reasoning quality and don't mind paying a bit more.
- Use both via a routing layer - send simple tasks to the cheaper one and complex tasks to the smarter one. This is the highest-ROI optimization in production AI.
Estimate the real cost of either model for your prompts using our Token Calculator.