Claude Opus 5.5
- Context
- 1,000,000
- Max output
- 128,000
- Input / MTok
- $4.00
- Cached / MTok
- $0.20
- Output / MTok
- $20.00
- Input types
- text + image
AGENTIC KNOWLEDGE WORK / VERIFIED 2026-10-04
Claude Opus 5.5
vs Grok 4.7
Compare Anthropic and xAI on verified context, output policy, reasoning controls, cache economics and Standard token rates.
LIVE VERIFIED FACTS
Current facts from the SXF model database.
Grok 4.7
- Context
- 500,000
- Max output
- No separate limit
- Input / MTok
- $2.00
- Cached / MTok
- $0.50
- Output / MTok
- $6.00
- Input types
- text + image
Facts are generated from the canonical model catalog, not copied into this comparison.Current data ↗Change ledger ↗
DECISION FACTORS
What materially changes the choice.
Context capacity
Claude Opus 5.5 publishes the larger context window: 1,000,000 vs 500,000 tokens (2.0×).
Input modalities
Both list image, text as input types.
Direct token cost
For 100K uncached input + 10K output tokens, Grok 4.7 is lower at $0.26 vs $0.6 (2.3× difference).
Output policy
Claude Opus 5.5: 128,000. Grok 4.7: No separate limit.
HOW TO DECIDE
Specifications narrow the field. Your workload decides.
Context, modalities and direct token economics are comparable from official sources. Coding quality, latency, reliability and agent success should be measured on your own acceptance tests before production routing.
Replay real tasks
Use representative prompts, files, tools and expected outputs from the workload you plan to ship.
Measure task cost
Include retries, cached tokens, long-context rules and tool charges—not only headline input price.
Track failures
Record hallucinations, tool errors, timeout behavior and human corrections alongside pass rate.
Route by task
A portfolio can outperform a one-model policy when different task classes have different cost and capability needs.
INDEPENDENT EVALUATIONS
Comparable evidence, configuration attached.
ComparableArtificial Analysis
Artificial Analysis Intelligence Index 4.3.2
Claude Opus 5.5: 58 · Grok 4.7: 46
Group: artificial-analysis-v4.3.2A higher score is meaningful only within the exact comparable group shown. Under-review benchmarks are never used alone for a quality conclusion.
WHAT CHANGED
Changes affecting this comparison.
No post-baseline factual changes recorded for Claude Opus 5.5, Grok 4.7 since 2026-09-27.
VERIFIED BASELINE2026-09-27Current facts remain aligned with the SXF ledger.
QUICK ANSWERS
Which has the larger context window: Claude Opus 5.5 or Grok 4.7?
Claude Opus 5.5 publishes the larger context window: 1,000,000 vs 500,000 tokens (2.0×).
Which is cheaper: Claude Opus 5.5 or Grok 4.7?
For 100K uncached input + 10K output tokens, Grok 4.7 is lower at $0.26 vs $0.6 (2.3× difference).
Does SXF declare an overall winner?
No. This page compares source-backed specifications and economics. Quality, latency and task success require workload-specific evaluation evidence.