High-volume, cost-sensitive work
Choose Claude Opus 4.5
Claude Opus 4.5 costs 11% less on a typical mix of three input tokens for every output token ($10.00 against $11.25 per million tokens).
Chat Latest vs Claude Opus 4.5: price, context and capabilities
Choose Chat Latest for very long inputs and the latest release. Choose Claude Opus 4.5 for high-volume, cost-sensitive work and writing and code generation.
In short
- Claude Opus 4.5 is 11% cheaper than Chat Latest at the headline price ($10.00 / 1M tokens vs $11.25 / 1M tokens).
- Chat Latest reads more per request: 400k tokens against 200k.
- Chat Latest is the newer model (May 5, 2026, against November 2025).
- Only Claude Opus 4.5 offers reasoning.
Which should you choose?
Each answer below comes straight from the published prices, specifications and independent benchmark results.
Writing and code generation
Choose Claude Opus 4.5
Claude Opus 4.5 charges $25.00 per million output tokens, against $30.00 for Chat Latest. Output dominates the bill when answers are long.
Very long inputs
Choose Chat Latest
Chat Latest reads up to 400k tokens per request, against 200k for Claude Opus 4.5.
Latest release
Choose Chat Latest
Chat Latest is the newer release (May 5, 2026, against November 2025 for Claude Opus 4.5).
Monthly cost at three volumes
| Volume | Chat Latest | Claude Opus 4.5 | Difference |
|---|---|---|---|
| Prototype: 1M input, 250K output tokens | $12.50 | $11.25 | Claude Opus 4.5, $1.25 less |
| Production: 20M input, 5M output tokens | $250.00 | $225.00 | Claude Opus 4.5, $25.00 less |
| Scale: 500M input, 100M output tokens | $5,500 | $5,000 | Claude Opus 4.5, $500.00 less |
Standard rates, without caching or batch discounts. Volumes are per month.
Specifications side by side
| Chat Latest | Claude Opus 4.5 | |
|---|---|---|
| Provider | OpenAI | Anthropic |
| Category | Language models | Language models |
| Status | Generally available | Legacy |
| Headline price | $11.25 / 1M tokens | $10.00 / 1M tokens |
| Input | $5.00 / 1M tokens | $5.00 / 1M tokens |
| Output | $30.00 / 1M tokens | $25.00 / 1M tokens |
| Cached input | $0.50 / 1M tokens | $0.50 / 1M tokens |
| Context window | 400k | 200k |
| Max output | 128k | 64k |
| Released | May 5, 2026 | November 2025 |
| Knowledge cutoff | April 2026 | No data |
| Licence | Proprietary | Proprietary |
| Capabilities | Vision, Tool calling, Structured output, Prompt caching, Batch API | Vision, Reasoning, Tool calling, Structured output, Prompt caching, Batch API |
| API model id | chat-latest | claude-opus-4-5-20251101 |
Benchmarks side by side
Leader in bold.
| Benchmark | Chat Latest | Claude Opus 4.5 |
|---|---|---|
| Terminal-Bench Hard | No data | 40.9% |
| GPQA Diamond | No data | 81% |
| Humanity's Last Exam | No data | 13.2% |
| IFBench (instruction following) | No data | 43% |
| τ²-Bench (agentic tool use) | No data | 86.3% |
| MMMU-Pro (visual reasoning) | No data | 71.2% |
| Long-context reasoning (AA-LCR) | No data | 70.7% |
Independent evaluations by Artificial Analysis, run the same way for every model, at the reasoning setting shown. Percentages unless marked as an index.
Frequently asked questions
Should I choose Chat Latest or Claude Opus 4.5?
Choose Chat Latest for very long inputs and the latest release. Choose Claude Opus 4.5 for high-volume, cost-sensitive work and writing and code generation.
Which is cheaper, Chat Latest or Claude Opus 4.5?
Claude Opus 4.5 is 11% cheaper than Chat Latest at the headline price ($10.00 / 1M tokens vs $11.25 / 1M tokens).
Which has the larger context window, Chat Latest or Claude Opus 4.5?
Chat Latest reads more per request: 400k tokens against 200k.
What is the difference between Chat Latest and Claude Opus 4.5?
Chat Latest is made by OpenAI and Claude Opus 4.5 by Anthropic. Claude Opus 4.5 is 11% cheaper than Chat Latest at the headline price ($10.00 / 1M tokens vs $11.25 / 1M tokens). Chat Latest reads more per request: 400k tokens against 200k. Chat Latest is the newer model (May 5, 2026, against November 2025). Only Claude Opus 4.5 offers reasoning.
How much do Chat Latest and Claude Opus 4.5 cost per month?
At 20 million input and 5 million output tokens a month, Chat Latest costs $250.00 and Claude Opus 4.5 costs $225.00, at standard rates.
Which is newer, Chat Latest or Claude Opus 4.5?
Chat Latest was released on May 5, 2026 and Claude Opus 4.5 on November 2025.