Claude Opus 5.5 vs GPT-6 Astra
A side-by-side of live API prices, providers, speed, usage and benchmarks. No verdict: the right choice depends on your workload.
Claude Opus 5.5 costs $4.00 per 1M input and $20.00 per 1M output tokens at the standard tier, via Anthropic; GPT-6 Astra costs $10.00 and $50.00, via OpenAI. At a 3:1 input:output mix, Claude Opus 5.5 is 60% cheaper than GPT-6 Astra.
Why these two are compared
Anthropic describes Claude Opus 5.5 as its flagship for demanding reasoning, coding and long-horizon agentic work; OpenAI describes GPT-6 Astra as its flagship for demanding end-to-end work. Both developers name long-horizon agentic and software-engineering work as a strength, so this is the pair teams weigh when choosing a top-tier model.
Side by side
| Measure | Claude Opus 5.5 | GPT-6 Astra |
|---|---|---|
| Developer | Anthropic | OpenAI |
| Released | 2026-09-22 | 2026-09-04 |
| Standard price, input / output per 1M | $4.00 / $20.00 | $10.00 / $50.00 |
| Blended price (3:1) | $8.00 | $20.00 |
| Cheapest standard provider | Anthropic | OpenAI |
| Cache read per 1M | $0.20 | $1.00 |
| Providers at the standard tier | 5 | 3 |
| Context window (tokens) | 1,000,000 | 1,050,000 |
| Max output (tokens) | 128,000 | 128,000 |
| Input modalities | text, image, file | file, image, text |
| Long-prompt pricing | No threshold listed | Prompts over 272,000 tokens: $20.00 input / $75.00 output per 1M tokens |
| Fastest endpoint | 176 tok/sAnthropic (Fast tier) | 114 tok/sOpenAI (Ultrafast tier) |
| Lowest latency | 794 msGoogle (Europe region) | 1.86 sOpenAI (Ultrafast tier) |
| OpenRouter tokens (2026-10-16) | 933.37B | 61.76B |
| AA intelligence | 57.6 | 52.7 |
| AA coding | Not reported | 76.9 |
| AA agentic | Not reported | 51.0 |
“Not reported” means the source publishes no value. AA scores are the Artificial Analysis indexes reported through OpenRouter (CC BY 4.0), not SF·SIX measurements.
Cost for three example workloads
| Workload | Claude Opus 5.5 / month | GPT-6 Astra / month |
|---|---|---|
| Support chatbot50,000 requests × 1,500 in / 400 out tokens | $700.00 | $1,750.00 |
| RAG / research assistant20,000 requests × 8,000 in / 700 out tokens | $920.00 | $2,300.00 |
| Batch summarisation10,000 requests × 10,000 in / 500 out tokens | $500.00 | $1,250.00 |
Standard headline prices; caching and long-context surcharges not included. Price your own workload.
Claude Opus 5.5 providers
| Provider and terms | Input / 1M | Output / 1M | Throughput | Latency |
|---|---|---|---|---|
| Amazon Bedrock | $4.00 | $20.00 | 75 tok/s | 4.61 s |
| Anthropic | $4.00 | $20.00 | 74 tok/s | 3.48 s |
| AzureGlobal endpoint | $4.00 | $20.00 | 78 tok/s | 2.84 s |
| Claude Platform on AWS | $4.00 | $20.00 | 76 tok/s | 4.23 s |
| GoogleGlobal endpoint | $4.00 | $20.00 | 80 tok/s | 2.95 s |
| Amazon Bedrockeu-west-1 region | $4.40 | $22.00 | 75 tok/s | 4.46 s |
| Amazon Bedrockus-east-1 region | $4.40 | $22.00 | 67 tok/s | 3.88 s |
| AzureUS region | $4.40 | $22.00 | Not reported | Not reported |
| GoogleEurope region | $4.40 | $22.00 | 95 tok/s | 794 ms |
| GoogleUS region | $4.40 | $22.00 | 91 tok/s | 2.40 s |
GPT-6 Astra providers
| Provider and terms | Input / 1M | Output / 1M | Throughput | Latency |
|---|---|---|---|---|
| Azure | $10.00 | $50.00 | 33 tok/s | 6.25 s |
| OpenAI | $10.00 | $50.00 | 39 tok/s | 3.30 s |
| Amazon Bedrockus-west-2 region | $11.00 | $55.00 | Not reported | Not reported |
| AzureUS region | $11.00 | $55.00 | 32 tok/s | 3.05 s |
| OpenAIFast tier | $20.00 | $100.00 | 29 tok/s | 3.33 s |
| OpenAIUltrafast tier | $60.00 | $300.00 | 114 tok/s | 1.86 s |
| OpenAIFlex tier | $5.00 | $25.00 | 61 tok/s | 2.66 s |
Related comparisons
Sources and method
Prices are USD per 1M tokens at the standard service tier in the default region: the cheapest qualifying provider per model, with flex, batch, priority and fast endpoints and unusually low outliers never used as the headline. “Blended” weights input and output 3:1. Prices: OpenRouter, observed at the times on each model page. Speed: OpenRouter, previous 30 minutes. Usage: OpenRouter rankings, latest full UTC day (CC BY 4.0).