Claude Opus 5.5 vs GPT-6 Astra
Rank, tier, score and price side by side, from our weekly rankings. Scores are editorial opinion based on public sources.
A
Claude Opus 5.5
B
GPT-6 Astra
- ProviderAnthropicOpenAI
- Rank#1Higher rank#2
- TierSS
- Score94.5Higher score93.5
- Price$4 input / $20 output per 1M tokens (API); included in Claude Pro, Max, Team and Enterprise plansAPI $10 input / $50 output per 1M tokens
- TaglineAnthropic's current Opus model (September 2026), which Anthropic says performs at the level of Claude Fable 5.1 on most work at a lower price than Opus 5.OpenAI's GPT-6 frontier model (September 2026) for end-to-end reasoning, coding, computer use and research, with a 1.05M-token context window.
| Attribute | Claude Opus 5.5 | GPT-6 Astra |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Rank | #1Higher rank | #2 |
| Tier | S | S |
| Score | 94.5Higher score | 93.5 |
| Price | $4 input / $20 output per 1M tokens (API); included in Claude Pro, Max, Team and Enterprise plans | API $10 input / $50 output per 1M tokens |
| Tagline | Anthropic's current Opus model (September 2026), which Anthropic says performs at the level of Claude Fable 5.1 on most work at a lower price than Opus 5. | OpenAI's GPT-6 frontier model (September 2026) for end-to-end reasoning, coding, computer use and research, with a 1.05M-token context window. |