Claude Opus 4.8 vs Composer 2.5

Name: Claude Opus 4.8
Author: Anthropic

Claude Opus 4.8 and Composer 2.5 answer different decisions. Opus 4.8 is a generally available API model for coding, computer use, and long-horizon agents; Composer 2.5 is a Cursor-native coding agent built on Kimi K2.5 and evaluated inside Cursor's product context.

Pick Claude Opus 4.8 when you need API access, independent production integration, computer-use capability, or the strongest verified coding signal in this pair. Pick Composer 2.5 when your work lives inside Cursor and token cost matters: its standard tier is roughly one tenth of Opus 4.8 input pricing. Do not compare Composer's 79.8% SWE-Bench Multilingual number as if it were an Opus SWE-Bench Verified score.

Decision scorecard

Local evidence first

Signal	Claude Opus 4.8	Composer 2.5	How to read it
Product type	Standalone API model	IDE-native agent built on Kimi K2.5	Read downstream rows through the product-type lens before comparing benchmarks, prices, or provider availability.
Best for	API builders, multimodal apps, and non-IDE automation	Long Cursor IDE sessions and autonomous in-IDE coding	Use-case synthesis from product type, capability flags, context, and provider data.
Decision fit	Coding, RAG, and Agents	Coding, RAG, and Agents	Primary workload tags from local decision data.
Context window	1m	1m	Higher is better when prompts, retrieval chunks, or transcripts are large.
Cheapest output	$25/1M tokens	$2.50/1M tokens	Cheapest tracked provider route; verify your exact region and tier.
Provider routes	6 tracked	1 tracked	Broader coverage can reduce vendor lock-in and fallback risk.
Shared benchmarks	CursorBench leader	6 shared	Visible benchmark lead is 7.7 points on CursorBench.

Decision tradeoffs

Choose Claude Opus 4.8 when...

Claude Opus 4.8 holds a shared-benchmark lead on CursorBench, ahead by 7.7 points.
Claude Opus 4.8 has broader tracked provider coverage for fallback and route flexibility.
Claude Opus 4.8 uniquely exposes Vision, Multimodal, and Reasoning in local model data.
Local decision data tags Claude Opus 4.8 for Coding, RAG, and Agents.

Choose Composer 2.5 when...

Composer 2.5 holds a shared-benchmark lead on CursorBench, ahead by 3 points.
Composer 2.5 has the lower cheapest tracked output price at $2.50/1M tokens.
Composer 2.5 uniquely exposes IDE integration in local model data.
Local decision data tags Composer 2.5 for Coding, RAG, and Agents.

Monthly cost at traffic

Estimate token spend from the cheapest tracked input and output route or tier on this page.

Lower estimate Composer 2.5

Requests / monthInput tokens / requestOutput tokens / request

Claude Opus 4.8

$10,250

Cheapest tracked route/tier: Anthropic

Composer 2.5

$1,025

Cheapest tracked route/tier: Cursor Standard async

Estimated monthly gap: $9,225. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.

Switch friction

Claude Opus 4.8 -> Composer 2.5

No overlapping tracked provider route is sourced for Claude Opus 4.8 and Composer 2.5; plan for SDK, billing, or endpoint changes.
Composer 2.5 is $22.50/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
Check replacement coverage for Vision, Multimodal, and Reasoning before moving production traffic.
Composer 2.5 adds IDE integration in local capability data.

Composer 2.5 -> Claude Opus 4.8

No overlapping tracked provider route is sourced for Composer 2.5 and Claude Opus 4.8; plan for SDK, billing, or endpoint changes.
Claude Opus 4.8 is $22.50/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
Check replacement coverage for IDE integration before moving production traffic.
Claude Opus 4.8 adds Vision, Multimodal, and Reasoning in local capability data.

Specs

Specification	Claude Opus 4.8 Anthropic	Composer 2.5 Cursor (Anysphere)
Released	2026-05-28	2026-05-18
Context window	1m	1m
Parameters	—	—
Architecture	Decoder Only	-
License	Proprietary	Proprietary
Openness	Proprietary	Proprietary
Weights	Not released	Not released
Code	Not released	Not released
Commercial use	Commercial use: conditional	Commercial use: conditional
Knowledge cutoff	2026-01	-

Pricing and availability

Pricing attribute	Claude Opus 4.8	Composer 2.5
Input price	$5/1M tokens	Standard async $0.50/1M tokens Cursor Composer 2.5 standard tier. Fast interactive $3/1M tokens Cursor says fast has the same intelligence and is the default.
Output price	$25/1M tokens	Standard async $2.50/1M tokens Cursor Composer 2.5 standard tier. Fast interactive $15/1M tokens Cursor says fast has the same intelligence and is the default.
Providers	Anthropic AWS Bedrock GCP Vertex AI Microsoft Foundry OpenRouter Vercel AI Gateway	Cursor

Capabilities

Capability	Claude Opus 4.8	Composer 2.5
Vision	Yes	No
Multimodal	Yes	No
Reasoning	Yes	No
JSON / Tool use	Yes	Yes
Structured outputs	Yes	No
Code execution	Yes	Yes
IDE integration	No	Yes
Computer use	Yes	No
Parallel agents	Yes	Yes

Benchmarks

Benchmark	Claude Opus 4.8	Composer 2.5
CursorBench	63.8	56.1
CursorBench	62.3	56.1
CursorBench	59.4	56.1
CursorBench	53.1	56.1
CursorBench	58.0	56.1
CursorBench	56.1	56.1

Harness caveat. Composer 2.5 is measured as IDE-native agent built on Kimi K2.5, while Claude Opus 4.8 is standalone API model. Treat shared benchmark scores as directional because IDE or product scaffolding, tool access, prompt routing, and interaction mode can change real application results.

Continue comparing

Model pages

Labs and families

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Last reviewed: 2026-07-26. Data sourced from public model cards and provider documentation.

Both models

Claude Opus 4.8 Composer 2.5