MODEL PROOF
Claude Opus 4.8
BETTER VALUE OPTION
A stored alternative has an equal-or-higher measured score and an equal-or-lower price.
Claude Opus 5 · Δ score 44.1 points · same measured price · $10.00 / 1M tokens
Gemini 3.8 Flash is a further stored option with these losses: 128K → 66K max output
- Independent LMArena score
- 1,460.8 ± 4.16 · 52,535 votes
- Context window
- 1M
- Maximum output
- 128K
- Input modalities
- text, image, file
- Output modalities
- text
- Published input price
- $5.00 / 1M tokens
- Published output price
- $25.00 / 1M tokens
- Pricing kind
- fixed
Inspect complete billing conditions and endpoint terms below.
Every price dimension · USD per million tokens
| Input | $5.00/M |
|---|---|
| Output | $25.00/M |
| Cached input | $0.500/M |
| Cache write | $6.25/M |
| Cache write 1h | $10.00/M |
| Reasoning | Unknown/M |
| Web search | $0.01/call |
| Batch discount | 50% |
Who sells it
The same weights, different shops. Cheapest is not like-for-like when serving precision differs.
11 provider offers · rates, limits and conditions
Rates are USD per million tokens. Endpoint terms can differ even when the quoted price and precision match. A listed parameter is a provider declaration, not a task-success test.
| Seller | Input | Output | Precision | Uptime (1d) |
|---|---|---|---|---|
| Claude Platform on AWSclaude-on-aws Endpoint terms
| $5.00 | $25.00 | undeclared | 99.98% |
| Azureazure/global Endpoint terms
| $5.00 | $25.00 | undeclared | 97.05% |
| Amazon Bedrockamazon-bedrock Endpoint terms
| $5.00 | $25.00 | undeclared | 99.93% |
| Googlegoogle-vertex/global Endpoint terms
| $5.00 | $25.00 | undeclared | 99.98% |
| Anthropicanthropic Endpoint terms
| $5.00 | $25.00 | undeclared | 99.98% |
| Azureazure/us Endpoint terms
| $5.50 | $27.50 | undeclared | — |
| Amazon Bedrockamazon-bedrock/us Endpoint terms
| $5.50 | $27.50 | undeclared | — |
| Googlegoogle-vertex/us Endpoint terms
| $5.50 | $27.50 | undeclared | — |
| Amazon Bedrockamazon-bedrock/eu-west-1 Endpoint terms
| $5.50 | $27.50 | undeclared | 99.15% |
| Googlegoogle-vertex/europe Endpoint terms
| $5.50 | $27.50 | undeclared | — |
| Anthropicanthropic/fast Endpoint terms
| $10.00 | $50.00 | undeclared | 100.00% |
Independent scores
| LMArena Elo | 1460.8high |
|---|
LMArena Elo under CC BY 4.0. Absence of another board is not a score of zero.
Best rankings by task
- agenticslides #1of 9 1294
- agenticslides(python-pptx) #1of 9 1310
- pptxslides #1of 8 1306
- python-pptxslides #2of 26 1298
- agentichtmlslides #3of 9 1227
- agenticslides(html) #3of 9 1230
- godotgamedev #4of 30 1236
- agenticgamedev #4of 24 1238
Capability
| Context window | 1M |
|---|---|
| Max output | 128K |
| Input modes | text, image, file |
| Tool use | yes |
| Reasoning | optional |
| Open weights | no |
Provenance
| Price source | openrouter.ai |
|---|---|
| Fetched | 2026-09-23 |
| Quality data | verified |
| Cross-checked | vendor page |
Claude Opus 4.8 is Anthropic's most capable generally available model in the Opus family. It supports text, image, and file inputs with text output, with reasoning support and a 1M-token...
Questions this page answers
What does Claude Opus 4.8 cost?
$5.00/M in, $25.00/M out in this catalogue, as of the fetch date on this page. That is the API row, not a subscription.
Does Claude Opus 4.8 have an independent quality score?
Claude Opus 4.8 has an LMArena score in this catalogue.
What beats Claude Opus 4.8?
Claude Opus 5 has an equal-or-higher measured score and an equal-or-lower price.
Does this page use Artificial Analysis scores for Claude Opus 4.8?
No. Artificial Analysis figures are not published here. Quality on this page is LMArena Elo where a score exists; otherwise the row is unrated.
MODEL MONUMENT
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The verdict as one SVG, for a README or a docs page. It states this model's dominance status at the balanced workload on the LMArena lens, with the date it was computed, and it is rebuilt with the catalogue — so it changes when the verdict changes, including to one you would rather it did not.
[](https://undominated.ai/models/anthropic__claude-opus-4.8/)<a href="https://undominated.ai/models/anthropic__claude-opus-4.8/"><img src="https://undominated.ai/badge/anthropic__claude-opus-4.8.svg" alt="Claude Opus 4.8 — Undominated.ai dominance verdict" height="36"></a>Direct file: https://undominated.ai/badge/anthropic__claude-opus-4.8.svg — a static SVG, written by scripts/build-badges.mjs on every build, so the copy you embed is never
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