GPT-6 Astra vs Claude Opus 5
Side-by-side comparison of API pricing, specs, benchmarks, and capabilities
| Specification |
by OpenAI
|
by Anthropic
|
|---|---|---|
| Overview | ||
| Status | Current flagship | Current flagship |
| Released | ||
| Pricing per million tokens | ||
| Input | $10.00/Mtok | $5.00/Mtok |
| Output | $50.00/Mtok | $25.00/Mtok |
| Blended avg | $20.00/Mtok | $10.00/Mtok |
| Cached input | $1.00/Mtok | $0.500/Mtok |
| Price basis | OpenAI's rate card prices this model by context length: the tracked figure is the short-context tier, and prompts over 272K input tokens bill at the long-context tier of $20 input / $2 cached input / $25 cache write / $75 output per 1M tokens — 2x input and cache rates and 1.5x output, applied to the full request. Cache writes bill at 1.25x the uncached input rate. Batch and Flex are 50% of Standard; Fast mode is 2x the applicable rate, and Fast is unavailable with EU data residency. | — |
| Specifications | ||
| Context window | 1M tokens | 1M tokens |
| Parameters | Proprietary | Proprietary |
| Speed (TPS) | — | — |
| Modalities | ||
| Input |
textimage
|
textimage
|
| Benchmarks source: Vellum LLM Leaderboard | ||
| Avg benchmark score | 96 | 84.2 |
| Perf / dollar | 4.8 | 8.4 |
| AutoBench | 41.4 | 26 |
| GPQA Diamond | 96 | — |
| SWE-Bench Verified | — | 97 |
| BrowseComp | — | 90.8 |
| Humanity's Last Exam | — | 64.7 |
| Independent composite scores each on its own scale — not part of the average above | ||
| AA Intelligence Index | 61.2 | 63.1 |
| AA Agentic Index | 51.5 | 59.2 |
| AA-Omniscience Index (−100–100) | 43.4 | 37.1 |
| GDPval-AA v2 | 1629.3 ELO | 1823.9 ELO |
| Providers | ||
| Available from |
OpenAI — $10.00/$50.00/Mtok
|
Anthropic — $5.00/$25.00/Mtok
|
Cost at scale
1M tokens · 50/50 input/output| Volume | GPT-6 Astra | Claude Opus 5 | Savings |
|---|---|---|---|
| 1M tokens | $20 | $10 | $10 (50%) |
| 10M tokens | $200 | $100 | $100 (50%) |
| 100M tokens | $2000 | $1000 | $1000 (50%) |
| 1000M tokens | $20000 | $10000 | $10000 (50%) |
When to pick which
distilled from the pricing and spec data above- raw capability matters more than price: 96 vs 84.2 average benchmark score
- cost dominates: $10.00/Mtok blended vs $20.00 — 50% less on the same 50/50 token mix
The cheaper option here — Claude Opus 5 costs $10.00/Mtok blended on Anthropic.
Summary
GPT-6 Astra by OpenAI costs $10.00/Mtok input and $50.00/Mtok output, with a 1M-token context window. It supports text, image input.
Claude Opus 5 by Anthropic costs $5.00/Mtok input and $25.00/Mtok output, with a 1M-token context window. It supports text, image input.
On a blended cost basis, Claude Opus 5 is 50% cheaper than GPT-6 Astra.
On benchmarks, GPT-6 Astra scores higher (96 vs 84.2) on average. In terms of value, Claude Opus 5 has better performance per dollar (8.4 vs 4.8).
Note: Pricing is per million tokens. Actual costs vary with usage patterns, prompt caching, and batch discounts. Always verify against official provider pricing pages.