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Claude Haiku 4.5 vs Inkling Small

Close to a tie overall. Inkling Small costs 68% less for the same work.

Claude Haiku 4.5

by Anthropic · #42 of 67 overall

Coming soon · price at launch
Context
195K
Input / 1M
$1.00
Output / 1M
$5.00

Inkling Small

by · #41 of 67 overall

Coming soon · price at launch
Context
512K
Input / 1M
$0.45
Output / 1M
$1.20

Better overall

About even

Grade 57.0 vs 58.2

Cheaper

Inkling Small

68% less, $0.64 vs $2.00 blended

Larger context

Inkling Small

195K vs 512K tokens

SWE-bench Verified

Inkling Small

73.3% vs 80.2%

Head to head

Public benchmarks. Longer is better; each value links to its source.

LMArena TextElo-style rating · LMArena (CC BY 4.0) · Oct 15, 2026
Claude Haiku 4.5Claude Haiku 4.5: 1,414
LMArena WebDevElo-style rating · LMArena (CC BY 4.0) · Oct 13, 2026
Claude Haiku 4.5Claude Haiku 4.5: 1,330
LMArena CodingElo-style rating · LMArena (CC BY 4.0) · Oct 15, 2026
Claude Haiku 4.5Claude Haiku 4.5: 1,482
SWE-bench Verified% of issues resolved · SWE-bench · Oct 15, 2025 · reference
SWE-Bench Pro% of tasks resolved · Scale AI SWE-Bench Pro · reference
Claude Haiku 4.5Claude Haiku 4.5: —
Terminal-Bench 2.1% of tasks passed · Terminal-Bench · reference
Claude Haiku 4.5Claude Haiku 4.5: —

Claude Haiku 4.5Inkling Smallv = reported by the model’s maker. — = no public score yet. Arena bars span the range across every model we grade.

What it costs you

Drag to match your monthly usage.

Claude Haiku 4.5$400 /month
Inkling Small$138 /month

Inkling Small saves you $262 a month at this usage, $3,144 a year.

At a glance

AttributeClaude Haiku 4.5Inkling Small
Made byAnthropic
AvailabilityComing soonComing soon
Overall gradeStrong · 57.0Strong · 58.2
Overall rank#42 of 67#41 of 67
Input price$1.00 per 1M$0.45 per 1M
Output price$5.00 per 1M$1.20 per 1M
Context window200,000 tokens524,288 tokens
Reasoning levelsYesNo
Reads imagesYesYes
Model IDclaude-haiku-4-5inkling-small

Try both with one key

Same endpoint, same key, both hosted in the USA. Change one word to switch models, in Claude Code, Cursor, Cline or your own code.

Get your API key
# Ask either model the same thing
curl https://fullsendai.com/v1/chat/completions \
  -H "Authorization: Bearer $FULLSEND_API_KEY" \
  -d '{"model": "claude-haiku-4-5", "messages": [...]}'

# …then swap one word
  -d '{"model": "inkling-small", "messages": [...]}'

Questions

Is Claude Haiku 4.5 or Inkling Small better?

They grade within two points of each other (57.0 and 58.2), so pick on price and the benchmarks that match your work.

Which is cheaper, Claude Haiku 4.5 or Inkling Small?

Inkling Small: $0.45 in and $1.20 out per million tokens, against $1.00 and $5.00 through FullsendAI.

Which has the larger context window?

Inkling Small, with 524,288 tokens.

Can I use both with one API key?

Yes, once they launch: both are coming soon, at the prices shown, and both will use the same FullsendAI key.

Model rankingsAll benchmarksCompare other models

Scores: LMArena (CC BY 4.0), SWE-bench, Scale AI SWE-Bench Pro, Terminal-Bench, and model makers’ published results where marked v. Prices are FullsendAI’s, per million tokens. Data as of Oct 28, 2026.