GPT-6: Astra vs Claude Opus 5

Claude Opus 5 lists at $5 per 1M input and $25 per 1M output, half of GPT-6: Astra's $10 and $50. Few of OpenAI's and Anthropic's published evaluations overlap by name; where they appear to (ARC-AGI-3), the scores are so far apart (99.9% for Astra against 30.2 for Opus 5) that the two are almost certainly different task sets or harnesses, not a real capability gap of that size.

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Last verified 5 September 2026.

Use GPT-6 Astra in 4 steps

Step 1 of 4

Try GPT-6 Astra in the OneInfer playground without writing code, or create an API key in the Console to call it from your app.

export ONEINFER_API_KEY="your-api-key"

Harness caveat: do not read the ARC-AGI-3 rows as a head-to-head

OpenAI reports GPT-6: Astra at 99.9% on ARC-AGI-3. The Claude Opus 5 benchmark record in the OneInfer catalog lists an arc_agi_3 score of 30.2. A 69.7-point gap on a benchmark with the same name almost certainly means the two numbers were produced on different task subsets, difficulty tiers, or scoring harnesses rather than a genuine capability gap of that size. Treat this row as evidence of a naming collision, not a verified comparison, until both vendors publish a shared methodology.

Price

Dimension	GPT-6: Astra	Claude Opus 5	Notes
Input $/1M	$10.00	$5.00	Astra is 2x
Output $/1M	$50.00	$25.00	Astra is 2x
Cached input $/1M	$1.00	$0.50	Astra is 2x

What each vendor actually published

Claude Opus 5's catalog record carries swe_bench_pro at 79.2, frontier_bench_v0_1 at 43.3, and gdpval_aa_v2 at 1861.0 — none of which OpenAI has published a matching score for on GPT-6: Astra. Astra's own launch table reports FrontierMath Tier 4 (v2), ExploitBench, GPQA Diamond and others that Anthropic has not run for Opus 5. Outside the disputed ARC-AGI-3 row, there is currently no benchmark evaluated on both models under a shared methodology.

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When to pick which

Claude Opus 5 is the lower-cost route at half the per-token price with no evidence Astra clears a comparable bar on a shared benchmark. Pick GPT-6: Astra specifically for its 1,050,000-token context ceiling or one of its own published strengths (agentic coding, cybersecurity evaluation, computer use) where no Opus 5 equivalent has been published at all.

Frequently asked questions

Is GPT-6: Astra better than Claude Opus 5?

There is no shared, trustworthy benchmark to answer this directly. The one evaluation both catalogs report by the same name, ARC-AGI-3, shows a 69.7-point gap (99.9% for Astra against 30.2 for Opus 5) that is almost certainly a harness or task-set mismatch rather than a real capability difference of that size. On price, Opus 5 costs half as much per token.

Why is GPT-6: Astra so much more expensive than Claude Opus 5?

GPT-6: Astra lists at $10 per 1M input and $50 per 1M output, twice Claude Opus 5's $5 and $25. Astra's premium reflects its position as OpenAI's frontier flagship rather than a mid-tier model; Opus 5 is Anthropic's lower-cost tier within its own current lineup.

Put GPT-6: Astra to work

Fund a controlled evaluation, start with a prepared prompt, and measure quality and cost on your own workload.

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