Quality
Known Good Index and the capability indices, side by side
Each index is min-max normalised across tracked models and scaled 0–100 from published evaluations. We do not run these evaluations.
| Metric | Anthropic: Claude Opus 4.7 | OpenAI: GPT-5 Nano |
|---|---|---|
| Known Good Index | 94 | 57 |
| Coding Index | 100 | — |
| Mathematics Index | 98 | 89 |
| Science Index | 95 | 69 |
| Reasoning Index | 86 | — |
| Agentic Index | 100 | 21 |
| Openness Index | 5 | 5 |
Quality Breakdown
Every evaluation both models report a published score for
Bar = Anthropic: Claude Opus 4.7 · marker = OpenAI: GPT-5 Nano · scores ingested from Epoch AI (CC-BY 4.0)
Right-hand figures read Anthropic: Claude Opus 4.7 / OpenAI: GPT-5 Nano. Anthropic: Claude Opus 4.7 leads on 3 of 3, OpenAI: GPT-5 Nano on 0.
Arena Elo
Human preference rating from blind pairwise votes
Elo from blind pairwise votes, ingested from Arena. Higher is better.
| Metric | Anthropic: Claude Opus 4.7 | OpenAI: GPT-5 Nano |
|---|---|---|
| Text Arena | 1,482 | — |
| Text Arena (style controlled) | 1,494 | — |
Price & Cost
Published API pricing by token type
USD per 1M tokens. Blended is a 3:1 input:output mix. Live from OpenRouter, cross-checked against models.dev. Lower is better.
| Metric | Anthropic: Claude Opus 4.7 | OpenAI: GPT-5 Nano |
|---|---|---|
| Input $/1M | $5.00 | $0.05 |
| Output $/1M | $25.00 | $0.40 |
| Blended $/1M | $10.00 | $0.14 |
| Cache read $/1M | $0.500 | $0.005 |
Context Window
Maximum input accepted and maximum output emitted
Provider-declared limits, from metadata via models.dev and OpenRouter. Higher is better.
| Metric | Anthropic: Claude Opus 4.7 | OpenAI: GPT-5 Nano |
|---|---|---|
| Context window | 1.00M | 400k |
| Max output tokens | 128k | 128k |
Speed & Latency
Median throughput and time to first token across hosting providers
Medians across all tracked providers, derived from OpenRouter endpoint telemetry.
| Metric | Anthropic: Claude Opus 4.7 | OpenAI: GPT-5 Nano |
|---|---|---|
| Output tokens/s | 52 | 121 |
| Time to first token | 1.4s | 2.9s |
Providers
Which hosts serve each model, and at what price and speed
| Provider | Anthropic: Claude Opus 4.7 blended | Anthropic: Claude Opus 4.7 tok/s | OpenAI: GPT-5 Nano blended | OpenAI: GPT-5 Nano tok/s |
|---|---|---|---|---|
| Google · first party | $10.00 | 70 | — | — |
| Anthropic · first party | $10.00 | 45 | — | — |
| Amazon Bedrock · first party | $10.00 | 17 | — | — |
| Azure · first party | $10.00 | — | $0.14 | 69 |
| OpenAI · first party | — | — | $0.07 | 225 |
Per-host pricing and telemetry from OpenRouter. A dash means that host does not serve that model.