OpenAI API vs Anthropic API
Claude Opus 5.5 leads the current AA Intelligence Index, 58 to 55, and output speed, 98.3 to 79.3 tokens/s. GPT-6.1 Sol has the lower illustrated request cost: $0.03 versus $0.06.
| Dimension | Winner | Margin | Evidence |
|---|---|---|---|
| SciCode (%) | Claude Opus 5.5 | 12.73 pp | GPT-6.1 Sol 54.17% / Claude Opus 5.5 66.90%12 |
| Intelligence Index | Claude Opus 5.5 | 3 points | GPT 55 / Claude 58 |
| Output speed (tokens/s) | Claude Opus 5.5 | 19.0 tokens/s | GPT 79.3 / Claude 98.3 tokens/s |
| Illustrated request cost | GPT-6.1 Sol | $0.03000 | GPT-6.1 Sol $0.03 / Claude Opus 5.5 $0.06 |
Model capabilities and output performance
Prices and request cost
| Provider | Input / 1M tokens | Output / 1M tokens | Context window (tokens) | Max output (tokens) |
|---|---|---|---|---|
| GPT-6.1 Sol3 | $2 | $10 | 1,050,000 | 128,0003 |
| Claude Opus 5.54 | $4 | $20 | 1,000,000 | 128,0004 |
| Product documentation | OpenAI API documentationAnthropic API documentation | |||
Capabilities and serving conditions
| Dimension | GPT-6.1 Sol | Claude Opus 5.5 |
|---|---|---|
| Compared model | GPT-6.1 Sol | Claude Opus 5.5 |
| Context / output limit | 1,050,000 / 128,000 tokens3 | 1,000,000 / 128K tokens4 |
| Tool-calling constraints | GPT-6.1 Sol uses Responses for tool calling; Chat Completions is supported without tools.3 | Claude Opus 5.5 uses adaptive thinking that cannot be disabled; forced tool use returns an error.4 |
When each option fits
GPT-6.1 Sol (Max)
Methodology and sources
SciCode is AA’s scientific-coding evaluation, reported as a percentage; higher is better. It is separate from the 10,000-input-token performance test and is not an in-editor Cline evaluation. Quality and performance use the configurations shown beside the model names. A current AA v5 Intelligence Index is displayed only where both models have a published value. AA performance uses the 10,000-input-token benchmark at each model’s displayed configuration; reasoning settings vary by model. Output speed is the median output rate. Answer latency measures the first answer token after reasoning, not the initial streamed reasoning chunk. For non-streamed reasoning and non-reasoning models, AA reports the same first-chunk and first-answer event. AA estimates answer latency from initial response and reasoning duration; it is not a separately sampled median. These are reference deployments, not Novita endpoint guarantees. The uncached cost example bills 10,000 input and 1,000 output tokens at each named seller’s tariff; it is not the cost of the AA benchmark. Prices, context and output limits use the cited seller sources.
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